Photographic material with two size population of silver halide grains and development inhibiting agent in an emulsion layer

In a light-sensitive direct posi silver halide color photographic material having photographic constituent layers comprising at least one silver halide emulsion layer containing latent image type silver halide grains not previously fogged, which is capable of giving a direct posi image by subjecting the whole surface to exposure or effecting surface development in the presence of a fogging agent, after image exposure, the improvement wherein said internal latent image type silver halide grains are composed of at least two groups of internal latent image type silver halide grains having average grain sizes different from each other, and at least one compound capable of releasing a development inhibiting substance or its precursor through the reaction with the oxidized product of a color developing agent is contained in at least one layer of said photographic constituent layers. According to the present invention, there can be obtained a direct posi color photographic material improved in processing stability, having smooth gradation and excellent image quality, in which the respective photographic performances of at least two groups of internal latent type silver halide grains having grains sizes different from each other are fully utilized.

BACKGROUND OF THE INVENTION 
This invention relates to a light-sensitive direct posi silver halide 
photographic material, more particularly to a light-sensitive color 
photographic material having an internal latent image type silver halide 
emulsion layer capable of giving a direct posi image by subjecting the 
whole surface to exposure or carrying out surface development in the 
presence of a fogging agent, after image exposure. 
Methods for obtaining direct posi images known in the prior art can be 
classified mainly into two types. In one of them, a silver halide emulsion 
having previously fogged nucleus is employed and posi image is obtained 
after development by destroying the fogged nucleus or the latent image at 
the exposed portion by utilizing solarization or Hershel effect, etc. In 
the other type, an internal latent image type silver halide emulsion not 
previously subjected to fogging is employed, and fogging treatment 
(treatment for forming developing nucleus) is applied after image exposure 
and then surface development is performed, or alternatively surface 
treatment is performed while applying fogging treatment (treatment for 
forming developing nucleus) after image exposure, whereby a posi image can 
be obtained. 
The above fogging treatment (treatment for forming developing nucleus) may 
be conducted by way of giving the whole surface exposure, chemically by 
use of a fogging agent, or by use of a strong developing solution, or 
further by heat treatment, etc. 
Of the above two methods for formation of posi images, the methods of the 
latter type are generally higher in sensitivity than the methods of the 
former type and therefore suitable for uses in which high sensitivity is 
required. 
In this field of the art, various techniques have been hitherto known. For 
example, there have been known the methods disclosed in U.S. Pat. Nos. 
2,592,250, 2,497,875, 2,588,982, 3,761,266, 3,761,276, 3,796,577 and U.K. 
Pat. No. 1,151,363. 
Although a light-sensitive photographic material for forming a posi image 
can be prepared by use of these known techniques, it has been desired to 
further improve photographic performance and solve the problems in 
manufacture in order for these light-sensitive photographic materials to 
be applied for various kinds of photographic fields. 
In this field of the art, it has been widely known to produce a 
light-sensitive direct posi photographic material by use of two or more 
kinds of internal latent image type emulsions. For example, U.S. Pat. No. 
4,035,185 discloses mixing of the core/shell type emulsions in which the 
extent of internal chemical sensitization is varied, but the emulsion 
which has been internally chemically sensitized to deeper extent is not 
sufficient in the effect of posi image formation. Thus, even a mixed 
emulsion is desired to attain still higher maximum density. 
Japanese Unexamined Patent Publications Nos. 111938/1983 and 77436/1984 
disclose mixing and overlaying of the core/shell type emulsion and the 
fine particulate emulsion. However, the fine particulate emulsion alone 
cannot form an image, but it is merely provided for improvement of coating 
power. Therefore, photographic performances possessed by the respective 
emulsions cannot be fully utilized, and the minimum density is also high. 
Also, in the silver halide emulsion layer having substantially the same 
light-sensitive wavelength region, by mixing internal latent type silver 
halide emulsions with different grains or coating of such emulsions in 
separate layers, a broad exposure latitude can be obtained or gradation 
can be controlled. However, since grains with different grain sizes are 
different in progress of development, gradation of so called poor 
continuation differing greatly between gradation at the leg portion and 
gradation at the shoulder portion may be obtained, and the results may not 
be necessarily satisfactory with respect to stability when the development 
processing conditions are varied. 
It has also been desired in the prior art to improve image quality of the 
light-sensitive silver halide color photographic material (hereinafter 
called color photographic material), above all sharpness. Particularly, in 
the case of a direct posi color photographic material, it has been found 
that sharpness is further deteriorated. Although the cause has not yet 
been clarified, it may be speculated as follows. That is, after image 
exposure of the direct posi color photographic material, developed nucleus 
is formed on the silver halide surface by subjecting the whole surface to 
exposure or carrying out surface development in the presence of a fogging 
agent. Accordingly, after the developed nucleus is formed, an abrupt 
developing reaction occurs, causing the oxidized product of the color 
developing agent to accumulated at high concentration and deteriorate 
image quality of the color developed dye image. Also, image quality 
deterioration, which becomes more marked as the development processing 
time is shortened, is an obstacle against rapid processing. 
Such image quality deterioration cannot be reduced to give fully 
satisfactory good image quality by optical means such as inclusion of a 
water-soluble dye in a color photographic material. 
Accordingly, the object of the present invention is to provide a direct 
posi color photographic material with improved processing stability, 
having smooth gradation and excellent image quality, in which the 
respective photographic performances of the internal latent type silver 
halide grains with different grains sizes are fully utilized. 
SUMMARY OF THE INVENTION 
The direct posi color photographic material of the present invention which 
solves the above technical task is a light-sensitive direct posi silver 
halide color photographic material having: (A) photographic constituent 
layers comprising at least one silver halide emulsion layer containing 
latent image type silver halide grains not previously fogged, which is 
capable of giving a direct posi image by subjecting the whole surface to 
exposure or effecting surface development in the presence of a fogging 
agent after image exposure, wherein said internal latent image type silver 
halide grains are composed of at least two groups of internal latent image 
type silver halide grains having average grain sizes different from each 
other, and (B) at least one compound capable of releasing a development 
inhibiting substance or its precursor through the reaction with the 
oxidized product of a color developing agent (hereinafter called DIR 
compound) contained in at least one layer of said photographic constituent 
layers. 
The photographic constituent layer as herein mentioned refers to all the 
hydrophilic colloid layers participating in image formation, as 
exemplified by silver silver halide emulsion layer, subbing layer, 
intermediate layer (mere intermediate layer, filter layer, UV-ray 
absorbing layer, anti-halation layer, etc.), protective layer, etc. 
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
The internal latent image type silver halide of the present invention can 
be selected suitably depending on the photographic characteristics or 
effects, etc., demanded for photographic materials. As the internal latent 
image type silver halide, reference can be made to, for example, Research 
Disclosure (hereinafter abbreviated as RD) No. 15162. The internal latent 
image type silver halide grains to be used in the present invention can be 
selected from any of the compositions of silver bromide, silver 
iodobromide, silver chlorobromide, silver chloroiodobromide, silver 
chloroiodide, silver chloride. Preferably, 80 mol% or less of silver 
chloride and 15 mol% or less of silver iodide are contained based on the 
total silver halide of said grains. 
As the internal latent image type silver halide grains of the present 
invention, there may be employed those obtained by chemical sensitization 
of the cores or the core/shell type emulsion in which a doping agent is 
absorbed internally in the grains, as described in Japanese Patent 
Publication No. 34213/1977. 
The internal latent image type silver halide grains of the present 
invention may employ the conversion type emulsion as disclosed in U.S. 
Pat. No. 2,592,250. It is also possible to use the core/shell type 
emulsion having the conversion type emulsion as the core as disclosed in 
Japanese Unexamined Patent Publication No. 127549/1980. 
The internal latent image type silver halide grains of the present 
invention can use the laminated type silver halide emulsion as disclosed 
in Japanese Patent Publication No. 1412/1983. 
In case where the silver halide grains of the present invention are 
composed of two groups of internal latent image type silver halide grains 
having average grain sizes different from each other, "two groups of 
internal latent image type silver halide grains having average grain sizes 
different from each other" refer to the case in which the average grain 
size of one group of said two groups of internal latent image type silver 
halide grains is 90% or less based on the average grain size of the other 
group of said two groups. 
The method for measurement of average grain size of silver halide grains is 
described in detail in, for example, "The Theory of Photographic Process", 
written by James, fourth edition, p. 100. 
At least two groups of the internal latent image type silver halide grains 
having average grain sizes different from each other to be used in the 
present invention may be also a poly-dispersed emulsion in which 
individual grains are distributed in a wide range of grain sizes, but 
preferably a mono-dispersed emulsion with narrow grain size distribution. 
Here, "mono-dispersed emulsion" means one in which 60 wt.% or more of 
individual silver halide grains should have sizes which are not different 
from the average grain size by 20% or more. The average grain size is 
preferably 0.2 to 1.4 .mu.m, more preferably 0.3 to 1.2 .mu.m. 
As the method for preparation of the above mono-dispersed emulsion, there 
may be employed typically the double jet method as disclosed in Japanese 
Patent Publication No. 36870/1973 and Japanese Unexamined Patent 
Publications Nos. 48520/1979 and 65521/1979, and also the premix method 
disclosed in Japanese Unexamined Patent Publication No. 158220/1979. 
At least two kinds of internal latent image type silver halide grains 
having different average grain sizes in the present invention can be mixed 
and coated as the same silver halide emulsion layer on a support, or 
alternatively they can be overlaid as separate silver halide emulsion 
layers. When they are overlaid, the order of coating may be such that 
either one of them may be nearer to the support. Also, in the case of 
overlaying, they can be coated adjacent to each other, or alternatively 
overlaid by coating through an intermediary layer such as an intermediate 
layer, etc. 
In using at least two groups of different silver halide grains in the 
present invention, the mixing ratio during usage thereof can be optimally 
determined by selecting the silver halide composition, mean grain sizes, 
average grain ratio, sensitizing conditions, etc., between the different 
kinds of grains so that they may be in conformity with the photographic 
characteristic demanded and the characteristic curve may be smooth. The 
mixing ratio is 5:95 to 95 to 95 to 5, and the optimum mixing ratio can be 
within the range from 10:90 to 90:10. In the case of overlaying, the above 
numerical values may be read as the amount of silver halide attached. 
The internal latent image type silver halide grains of the present 
invention should preferably be not chemically sensitized on the grain 
surfaces or sensitized, if any, to very slight extent. 
By "not previously fogged on the grain surfaces" is meant that the density 
obtained when a test strip, which is coated with the emulsion used in the 
present invention so as to give 35 mgAg/cm.sup.2 on a transparent film 
support, is developed without exposure with the surface developing 
solution A shown below at 20.degree. C. for 10 minutes does not exceed 
0.6, preferably 0.4. 
______________________________________ 
Surface developing solution A 
______________________________________ 
Metol 2.5 g 
l-ascorbic acid 10 g 
NaBO.sub.2.4H.sub.2 O 
35 g 
KBr 1 g 
Water added to one liter. 
______________________________________ 
Also, the silver halide emulsion according to the present invention gives 
sufficient density when the test strip as prepared above is developed 
after exposure with an inner developing solution B having the following 
recipe. 
______________________________________ 
Inner developing solution B 
______________________________________ 
Metol 2 g 
Sodium sulfite (anhydrous) 
90 g 
Hydroquinone 8 g 
Sodium carbonate (monohydrate) 
52.5 g 
KBr 5 g 
KI 0.5 g 
Water added to one liter. 
______________________________________ 
To describe in more detail, when a part of the above test strip is exposed 
to a light intensity scale over a predetermined time up to about one 
second and developed with the inner developing solution B at 20.degree. C. 
for 4 minutes, there is exhibited the maximum density which is at least 
5-fold, preferably at least 10-fold of that obtained when another part of 
said test strip exposed under the same conditions is developed with the 
surface developing solution A at 20.degree. C. for 4 minutes. 
As representative DIR compounds according to the present invention, there 
are DIR couplers in which a group capable of forming a compound having a 
development inhibiting action when eliminated from the active site is 
introduced at the active site of the coupler, as disclosed in U.K. Pat. 
No. 935,454, U.S. Pat. Nos. 4,095,984 and 4,149,886, and Japanese 
Unexamined Patent Publication No. 151944/1982. When the above DIR coupler 
undergoes the coupling reaction with the oxidized product of a color 
developing agent, the coupler mother nucleus forms a dye, while on the 
other hand releasing a development inhibitor. The present invention also 
includes compounds which release development inhibitors but not form dyes 
upon coupling reaction with the oxidized product of a color developing 
agent, as disclosed in U.S. Pat. Nos. 3,928,041, 3,958,993, 3,961,959, 
4,052,213, Japanese Unexamined Patent Publication Nos. 110529/1978, 
13333/1979 and 161237/1980. Further, the present invention includes the so 
called timing DIR compounds which are compounds in which the mother 
nucleus forms a dye or a colorless compound, while the timing group 
eliminated releases a development inhibitor through the intramolecular 
nucleophilic substitution reaction or elimination reaction, when reacting 
with the oxidized product of a color developing agent, as disclosed in 
Japanese Unexamined Patent Publications Nos. 145135/1979, 114946/1981 and 
154234/1982. 
Also, there are included timing DIR compounds in which the timing group as 
described above is bonded to the coupler mother nucleus which forms a 
completely diffusible dye when reacting with the oxidized product of a 
color developing agent, as disclosed in Japanese Unexamined Patent 
Publications Nos. 160954/1983 and 162949/1983. 
According to the present invention, more preferable DIR compounds can be 
represented by Formulae (I) and (II) shown below and, among them, the most 
preferable DIR compounds are those represented by Formula (II) shown 
below. 
EQU Coup-inhibitor Formula (I) 
In Formula, (I), Coup is a coupler component (compound) which can undergo 
coupling with the oxidized product of a color developing agent, as 
exemplified by open-chain ketomethylene compounds such as 
acylacetoanilides, acylacetic acid esters, etc.; dye forming couplers such 
as pyrazolones, pyrazolotriazoles, pyrazolinobenzimidazoles, indazolones, 
phenols, naphthols, etc.; and coupling components which do not 
substantially form dyes such as acetophenones, indanones, oxazolones, etc. 
The inhibitor in the above formula which is a component (compound) which is 
eliminated by the reaction with a color developing agent and inhibits 
development of silver halide. Preferable compounds may include 
heterocyclic compounds such as benztriazole, 3-octylthio-1,2,4-triazole, 
etc., and heterocyclic mercapto compounds. 
As the above heterocyclic group, there may be included tetrazolyl, 
thiadiazolyl, oxadiazolyl, thiazolyl, oxazolyl, imidazolyl, triazolyl 
groups, etc. More specifically, there are 1-phenyltetrazolyl, 
1-ethyltetrazolyl, 1-(4-hydroxyphenyl)tetrazolyl, 1,3,4-thiazolyl, 
5-methyl-1,3,4-oxadiazolyl, benzthiazolyl, benzoxazolyl, benzimidazolyl, 
4H-1,2,4-triazolyl groups and so on. 
In the above Formula (I), the inhibitor is bonded to the active site of 
Coup. 
EQU Coup-TIME-inhibitor Formula (II) 
In Formula (II), the inhibitor is the same as defined in the above Formula 
(I). Coup is also inclusive of the coupler component which forms 
completely diffusible dye similarly as that defined in Formula (I). Time 
is represented by Formulae (III), (IV), (V) and (VI), but is not limited 
only to these. 
##STR1## 
In formula (III), X represents a group of atoms necessary for completion of 
a benzene ring or a naphthalene ring. Y represents --O--, --S--, 
##STR2## 
(wherein R.sub.3 represents a hydrogen atom, an alkyl or aryl group), and 
is bonded to the coupling site. Each of R.sub.1 and R.sub.2 represents the 
same group as the above R.sub.3 and the group 
##STR3## 
is substituted at the ortho-position or para-position relative to Y and is 
bonded to the hetero atom contained in the inhibitor. 
##STR4## 
In Formula (IV), W is the same group as Y in the above Formula (III), and 
R.sub.4 and R.sub.5 are the same groups as R.sub.1 and R.sub.2 in Formula 
(III), respectively. R.sub.6 is a hydrogen atom, an alkyl, aryl, acyl, 
sulfone, alkoxycarbonyl group or a heterocyclic residue, and R.sub.7 
represents a hydrogen atom, an alkyl, aryl group, heterocyclic residue, an 
alkoxy, amino, acylamide, sulfoneamide, carboxy, alkoxycarbonyl, 
carbamoyl, or cyano group. And the timing group is bonded through W to the 
coupling site of Coup and is bonded through 
##STR5## 
to the hetero atom of the inhibitor. 
Next, an example of the timing group which releases an inhibitor through 
intramolecular nucleophilic substitution reaction is shown by Formula (V). 
##STR6## 
In Formula (V), Nu is a nucleophilic group having a oxygen, sulfur or 
nitrogen atom enriched in electrons and is bonded to the coupling site of 
Coup. E is an electrophilic group having a carbonyl group, a thiocarbonyl 
group, a phosfinyl group or a thiophosfinyl group deficient in electrons 
and is bonded to the hetero atom of the inhibitor. V is a bonding group 
which correlates sterically Nu and E with each other and is subject to 
intramolecular nucleophilic substitution reaction accompanied with 
formation of a 3-membered ring or 7-membered ring after release of Nu from 
Coup, and thereby can release the inhibitor. 
EQU --OCH.sub.2 -- Formula (IV) 
In the following, typical specific examples of the DIR compounds according 
to the present invention are shown, by which the present invention is not 
limited. 
##STR7## 
The DIR compound of the present invention can be added in the 
light-sensitive silver halide emulsion layer and/or non-light-sensitive 
photographic constituent layer, but it should preferably be added in the 
light-sensitive silver halide emulsion layer. 
Two or more kinds of DIR compounds of the present invention can be 
contained in the same layer. Alternatively, the same DIR compound may also 
be contained in two or more different layers. 
Generally, these DIR compounds should preferably be used in an amount of 
2.times.10.sup.-4 to 5.times.10.sup.-1 mol per 1 mol of silver in the 
emulsion layer, more preferably from 1.times.10.sup.-3 to 
1.times.10.sup.-1 mol. 
For incorporating the DIR compounds in the silver halide emulsion or 
coating solution of other photographic constituent layer according to the 
present invention, when said DIR compounds are alkali-soluble, they may be 
added as alkaline solutions; when they are oil-soluble, they can 
preferably be dissolved in a high boiling solvent, optionally together 
with a low boiling solvent, according to the methods as disclosed in U.S. 
Pat. Nos. 2,322,027, 2,801,170, 2,801,171, 2,272,191 and 2,304,940 to be 
dispersed in fine particles before addition into the silver halide 
emulsion. If desired, a hydroquinone derivative, a UV-ray absorber, a 
color fading preventive, etc., may also be used in combination. Also, two 
or more kinds of DIR compounds may be used as a mixture. 
In a further preferred method for addition of DIR compounds, one or two or 
more kinds of said DIR compounds, optionally together with other couplers, 
a hydroquinone derivative, a color fading preventive, a UV-ray absorber, 
etc., are dissolved in a high boiling solvent such as organic acid amides, 
carbamates, esters, ketones, urea derivatives, ethers, hydrocarbons, 
specifically di-n-butyl phthalate, tricresyl phosphate, triphenyl 
phosphate, di-isooctyl azelate, di-n-butyl sebacate, tri-n-hexyl 
phosphate, N,N-diethylcaprylamidobutyl, N,N-diethyllaurylamide, 
n-pentadecyl phenyl ether, dioctyl phthalate, n-nonylphenol, 
3-pentadecylphenyl ethyl ether, 2,5-disec-amylphenyl butyl ether, 
monophenyl-di-o-chlorophenyl phosphate or fluoroparraffins, and/or a low 
boiling solvent such as methyl acetate, ethyl acetate, propyl acetate, 
butyl acetate, butyl propionate, cyclohexanol, diethyleneglycol 
monoacetate, nitromethane, carbon tetrachloride, chloroform, cyclohexane, 
tetrahydrofuran, methyl alcohol, acetonitrile, dimethylformamide, dioxane, 
methyl ethyl ketone, etc., the resultant solution is mixed with an aqueous 
solution containing an anionic surfactant such as alkylbenzenesulfonic 
acid and alkylnaphthalenesulfonic acid and/or a nonionic surfactant such 
as sorbitane sesquioleic acid ester and sorbitane monolauryl acid ester 
and/or a hydrophilic binder such as gelatin, etc., emulsified by means of 
a high speed rotary mixer, a colloid mill or a ultrasonic dispersing 
device, etc., and added into the silver halide emulsion. 
Otherwise, the above coupler may also be dispersed by use of the latex 
dispersing method. The latex dispersing method and its effect are 
described in Japanese Unexamined Patent Publications Nos. 74538/1974, 
59943/1976, 32552/1979 and Research Disclosure, August, 1976, No. 14850, 
p. 77-79. 
Suitable latices are homopolymers, copolymers or terpolymers of monomers 
such as styrene, acrylate, n-butyl acrylate, n-butylmetharylate, 
2-acetoacetoxyethyl methacrylate, 
2-(methacryloyloxy)ethyltrimethylammoniummethosulfate, sodium 
3-(methacryloyloxy)propane-1-sulfonate, N-isopropylacrylamide, 
N-[2-(2-methyl-4-oxopentyl)]acrylamide, 
2-acrylamide-2-methylpropanesulfonic acid, etc. 
The above DIR compounds can be synthesized according to the methods as 
described in U.S. Pat. Nos. 3,227,554, 3,615,506, 3,617,291, 3,632,345, 
3,928,041, 3,933,500, 3,938,996, 3,958,993, 3,961,959, 4,046,574, 
4,052,213, 4,063,950, 4,095,984, 4,149,886, 4,234,678, U.K. Patent Nos. 
2,072,363, 2,070,266, Research Disclosure 21228 (1981), Japanese 
Unexamined Patent Publications Nos. 81144/1975, 81145/1975, 13239/1976, 
64927/1976, 104825/1976, 105819/1976, 65433/1977, 82423/1977, 117627/1977, 
130327/1977, 154631/1977, 7232/1978, 9116/1978, 29717/1978, 70821/1978, 
103472/1978, 110529/1978, 135333/1978, 143223/1978, 13333/1979, 
49138/1979, 114241/1979, 35858/1982, 145135/1979, 161237/1980, 
114946/1981, 154234/1982, 56837/1982, 160954/1983 and 162949/1983. 
The development inhibitor released from the DIR compound according to the 
present invention during development corresponding to the density of the 
image inhibits development corresponding to the image density within the 
layer, when the layer is a light-sensitive emulsion layer, whereby the so 
called intra-image effect such as improvement in sharpness of the image, 
etc., can be obtained. On the other hand, when the development inhibitor 
released is diffused into another layer, there is obtained the so called 
inter-image effect such as the masking action which inhibits development 
in another layer corresponding to the image density in the layer from 
which it was diffused. Thus two kinds of image effects can be obtained. 
The DIR compound according to the present invention can be added in 
light-sensitive silver halide emulsion layers and/or non-light-sensitive 
photographic constituent layers. Preferably, it may be added in at least 
one layer of silver halide emulsion layers. For example, when it is 
applied for a conventional multilayer color photographic material having a 
blue-sensitive silver halide emulsion, a green-sensitive silver halide 
emulsion and a red-sensitive silver halide emulsion, it may be contained 
in one layer or two or more layers of these emulsion layers. 
The silver halide emulsion according to the present invention can be 
sensitized with a sensitizing dye conventionally used. The combinations of 
sensitizing dyes to be used for ultra-color sensitization of internal 
latent image type silver halide emulsion, nega type silver halide 
emulsions are also useful for the silver halide emulsion of the present 
invention. Concerning sensitizing dyes, reference can be made to Research 
Disclosure No. 15162. 
The color photographic material of the present invention can be subjected 
to image exposure according to a conventional method, followed by surface 
development to give easily a direct posi image. That is, the principal 
steps for preparation of direct posi image comprises subjecting the 
internal latent image type color photographic material not previously 
fogged of the present invention to the treatment of forming a surface 
development nucleus by chemical action or photochemical action 
(hereinafter called fogging treatment) after image exposure, and then, 
namely after application of the fogging treatment and/or while applying 
the fogging treatment, carrying out the surface development. Here, the 
fogging treatment can be carried out by subjecting the whole surface to 
exposure or by use of a compound capable of forming a fog nucleus 
(hereinafter called fogging agent). 
In the present invention, the whole surface exposure is carried out by 
dipping or wetting the photographic material subjected to image exposure 
in a developer or another aqueous solution, followed by uniform exposure 
over the whole surface. As the light source to be employed here, any light 
within the sensitive wavelength region of the color photographic material 
may be available, and it is possible to irradiate a high luminance light 
such as a flush light for a short time or alternatively irradiate a weak 
light for a long time. 
The time for the whole surface exposure can be varied over a wide range 
depending on the photographic material, the developing conditions, the 
light source employed, etc., so that the best posi image can be finally 
obtained. 
In the present invention, as the fogging agent to be used, various kinds of 
compounds can be used, and the fogging agent may be present during the 
developing processing. For example, it can be contained in a constituent 
layer of the photographic material other than the support (among them, 
silver halide emulsion layer is particularly preferred), or in a 
developing solution or in processing solutions prior to developing 
processing. Its amount can be varied over a wide range depending on the 
purpose, and it is preferable to use 1 to 1500 mg, more preferably 10 to 
1000 mg of the fogging agent per mol of the silver halide when it is added 
in the silver halide emulsion layer. On the other hand, when added in 
processing solutions such as developing solutions, preferable amount added 
may be 0.01 to 5 g/liter, particularly preferably 0.05 to 1 g/liter. 
Examples of the fogging agent to be used in the present invention include 
hydrazines disclosed in U.S. Pat. Nos. 2,563,785, 2,588,982, or hydrazide 
or hydrazone compounds disclosed in U.S. Pat. No. 3,227,552; heterocyclic 
quaternary nitrogen salt compounds disclosed in U.S. Pat. Nos. 3,615,615, 
3,718,470, 3,719,494, 3,734,738 and 3,759,901; and further compounds 
having adsorptive groups onto the silver halide surface such as 
acylhydrazinophenylthio ureas disclosed in U.S. Pat. No. 4,030,925. Also, 
these fogging agents may be used in combination. For example, Research 
Disclosure No. 15162 describes about using a non-adsorptive type fogging 
agent and an adsorptive type fogging agent in combination. 
As the fogging agent to be used in the present invention, either 
nonadsorptive type or adsorptive type can be used and it is also possible 
to use both of them in combination. 
Typical examples of useful fogging agents include hydrazine compounds such 
as hydrazine hydrochloride phenylhydrazine hydrochloride, 
4-methylphenylhydrazine hydrochloride, 
1-formyl-2-(4-methylphenyl)hydrazine, 1-acetyl-2-phenylhydrazine, 
1-acetyl-2-(4-acetamidophenyl)hydrazine, 
1-methylsulfonyl-2-phenylhydrazine, 1-benzoyl-2-phenylhydrazine, 
1-methylsulfonyl-2-(3-phenylsulfonamidophenyl)hydrazine, formaldehyde 
phenylhydrazine and the like; N-substituted quaternary cycloammonium salts 
such as 3-(2-formylethyl)-2-methylbenzothiazoliniumbromide, 
3-(2-formylethyl)-2-propylbenzothiazoliniumbromide, 
3-(2-acetylethyl)-2-benzylbenzoselenazoliumbromide, 
3-(2-acetylethyl)-2-benzyl-5-phenylbenzoxazoliumbromide, 
2-methyl-3-[3-(phenylhydrazino)-propyl]benzothiazoliumbromide, 
2-methyl-3-[3-(p-tolylhydrazino)propyl]benzothiazoliumbromide, 
2-methyl-3-[3-(p-sulfophenylhydrazino)propyl]benzothiazoliumbromide, 
2-methyl-3-[3-(p-sulfophenylhydrazino)pentyl]benzothiazolium iodide, 
1,2-dihydro-3-methyl-4-phenylpyrido[2,1-b]benzothiazoliumbromide, 
1,2-dihydro-3-methyl-4-phenylpyrido[2,1-b]-5-phenylbenzoxazoliumbromide, 
4,4'-ethylenebis(1,2-dihydro-3-methylpyrido[2,1-b]benzothiazoliumbromide, 
1,2-dihydro-3-methyl-4-phenylpyrido[2,1-b]benzoselenazoliumbromide and the 
like; 
5-[1-ethylnaphtho(1,2-b)thiazolin-2-ylideneethylydene]-1-(2-phenycarbazoyl 
)methyl-3-(4-sulfamoylphenyl)-2-thiohydantoin, 
5-(3-ethyl-2-benzothiazolinydene)-3-[4-(2-formylhydrazino)phenyl]rhodanine 
, 1-[4-(2-formylhydrazino)phenyl]-3-phenylthiourea, 
1,3-bis[4-(2-formylhydrazino)phenyl]thiourea, and so on. 
The photographic material having the silver halide emulsion layer according 
to the present invention forms a direct posi image by subjecting the whole 
surface to exposure or effecting developing processing in the presence of 
a fogging agent, after image exposure. As the method for developing 
processing of the photographic material according to the present 
invention, any desired developing processing method may be employed, but 
preferably the surface developing processing method is used. The surface 
developing processing method means processing with a developing solution 
containing substantially no silver halide solvent. 
The color developing solution to be used in processing of the silver halide 
emulsion layer according to the present invention is an aqueous alkaline 
solution containing a color developing agent having a pH preferably of 8 
or higher, more preferably of 9 to 12. The aromatic primary amine 
developing agent as the color developing agent is a compound having 
primary amino group on the aromatic ring with an ability to develop the 
exposed silver halide, and further a precursor capable of forming such a 
compound may be added. 
Typical examples of the above color developing agent are p-phenylenediamine 
type compounds, and preferably examples include the following: 
4-Amino-N,N-diethylaniline, 3-methyl-4-amino-N,N-diethylaniline, 
4-amino-N-ethyl-N-.beta.-hydroxyethylaniline, 
3-methyl-4-amino-N-.beta.-hydroxyethylaniline, 
3-methyl-4-amino-N-ethyl-N-.beta.-methoxyethylaniline, 
3-methyl-4-amino-N-ethyl-N-.beta.-methanesulfonamidoethylaniline, 
3-methoxy-4-amino-N-ethyl-N-.beta.-hydroxyethylaniline, 
3-methoxy-4-amino-N-ethyl-N-.beta.-methoxyethylaniline, 
3-acetamido-4-amino-N,N-dimethylaniline, 
N-ethyl-N-.beta.-[.beta.-(.beta.-methoxyethoxy)ethoxy]ethyl-3-methyl-4-ami 
noaniline, 
N-ethyl-N-.beta.-(.beta.-methoxyethoxy)ethyl-3-methyl-4-aminoaniline, or 
salts thereof such as sulfates, hydrochlorides, sulfites, 
p-toluenesulfonates, etc. 
Further, those disclosed in, for example, Japanese Unexamined Patent 
Publications Nos. 64932/1973, 131526/1975, 95849/1976 and Bent et al, 
Journal of the American Chemical Society, vol. 73, p. 3100-3125, 1951 may 
also be included as typical examples. 
The amount of these aromatic primary amino compounds used may be determined 
depending on the activity of the developing solution set, and it is 
preferable to increase the amount used in order to increase the activity. 
The amount used may be within the range of from 0.0002 mol/liter to 0.7 
mol/liter. Also, depending on the purpose, two or more compounds may be 
suitably selected and used. For example, any derised combination can 
freely be used depending on purposes, etc., such as the combinations of 
3-methyl-4-amino-N,N-diethylaniline with 
3-methyl-4-amino-N-ethyl-N-.beta.-methanesulfonamidoethylaniline, 
3-methyl-4-amino-N-ethyl-N-.beta.-methanesulfonamidoethylaniline with 
3-methyl-4-amino-N-ethyl-N-.beta.-hydroxyethylaniline, etc. 
The color developing solution to be used in the present invention can 
further incorporate various components conventionally added, for example, 
alkali agents such as sodium hydroxide, sodium carbonate, etc., alkali 
metal sulfites, alkali metal hydrogen sulfites, alkali metal thiocyanates, 
alkali metal halides, benzyl alcohol, water softeners, thickeners and 
development promoters, as desired. 
Other additives than those as mentioned above which can be added to the 
above color developing solution may include, for example, bromides such as 
potassium bromide, ammonium bromide, alkali iodides, stain preventives, 
sludge preventives, preservatives, overlaying effect promoting agents, 
chelating agents, etc. 
The developing solution to be used in the present invention can further 
contain specific antifoggants and development inhibitors, or alternatively 
those additives in the developing solution may also be incorporated in the 
constituent layers of the photographic material as desired. Usually, 
useful antifoggants may include benzotriazoles such as 
5-methylbenzotriazole, benzimidazoles, benzothiazole, benzooxazoles, 
heterocyclic thiols such as 1-phenyl-5-mercaptotetrazole, aromatic and 
aliphatic mercapto compounds, etc. It is also possible to incorporate a 
development accellator such as a polyalkyleneoxide derivative or a 
quaternary ammonium salt compounds in the developing solution. 
In the silver halide emulsion according to the present invention, various 
additives for photography can be added as desired. 
Otherwise, in the present invention, the additives to be added depending on 
purposes may include wetting agents such as dihydroxyalkanes, etc.; 
further film property improving agents such as copolymers of alkyl 
acrylate or alkyl methacrylate with acrylic acid or methacrylic acid, 
styrene-maleic acid copolymers, styrene maleic anhydride half alkyl ester 
copolymers, etc., which are fine particulate polymeric materials 
dispersible in water obtained by emulsion polymerization; and also coating 
aids such as saponine, polyethyleneglycol lauryl ether, etc. It is also 
possible to use freely other additives for photography such as gelatin 
plasticizers, surfactants, UV-ray absorbers, pH controllers, antioxidants, 
antistatic agents, thickeners, graininess improvers, dyes, mordants, 
brighteners, development speed controllers, matting agents, etc. 
The silver halide emulsion prepared as described above is coated on a 
support through intermediary subbing layer, halation preventive layer, 
filter layer, etc., if necessary, to give an internal latent image type 
photographic material. 
It is useful to apply the photographic material according to the present 
invention for color photography and, in this case, dye image forming 
couplers of cyan, magenta and yellow should preferably be contained in the 
silver halide photographic emulsion. As the couplers, those conventionally 
used may be available. 
It is also useful to use a UV-ray absorber such as thiazolidone, 
benzotriazole, acrylonitrile, benzophenone compounds in order to prevent 
brown coloration of the dye images with active rays of short wavelength. 
Particularly, it is advantageous to use singly or in combination Tinuvin 
PS, 320, 326, 327 and 328 (all produced by Ciba Geigy Co.). 
As the support of the photographic material according to the present 
invention, any material may be used. 
Typical examples of the support may include polyethyleneterephthalate film, 
polycarbonate film, polystyrene film, polypropylene film, cellulose 
acetate film, glass, baryta paper, polyethylene laminated paper, etc., 
which are optionally applied with subbing treatment. 
In the silver halide emulsion layer according to the present invention, as 
a protective colloid or a binder, suitable gelatin derivatives other than 
gelatin can be used depending on the purpose. Examples of the suiltable 
gelatin derivative include acylated gelatin, guanidylated gelatin, 
carbamylated gelatin, cyanoethanolated gelatin, esterified gelatin and the 
like. 
Also, in the present invention, other hydrophilic binders can be contained 
depending on the purpose. Such binders may include colloidal albumin, 
agar, gum arabic, dextran, alginic acid, cellulose derivatives such as 
cellulose acetate hydrolyzed to acetyl content of 19 to 20%, 
polyacrylamide, imidated polyacrylamide, casein, vinyl alcohol polymer 
containing an urethane carboxylic acid group or a cyanoacetyl group such 
as vinyl alcoholvinyl aminoacetate copolymer, polyvinyl alcohol, 
polyvinylpyrrolidone, hydrolyzed polyvinyl acetate, polymers obtained by 
polymerization of a protein or a saturated acylated protein with a monomer 
having a vinyl group, polyvinylpyridine, polyvinylamine, polyaminoethyl 
methacrylate, polyethyleneamine, etc. They can be added depening on the 
purpose in the photographic light-sensitive material constituent layers 
such as emulsion layer or intermediate layer, protective layer, filter 
layer, backing layer, etc. Further, the above hydrophilic binder can 
incorporate suitable plasticizers, lubricants, etc., depending on the 
purpose. 
Also, the constituent layers of the internal latent image light-sensitive 
material according to the present invention can be hardened with any 
suitable film hardening agent. Examples of these film hardening agents 
include chromium salts, zirconium salts, aldehyde type compounds, 
halotriazine type compounds or polyepoxy compounds such as formaldehyde or 
mucohalogenic acid, ethyleneimine type, vinylsulfone type, acryloyl type 
film hardening agents, etc. 
Also, the photographic material according to the present invention can have 
a large number of various photographic constituent layers on a support 
such as emulsion layer, filter layer, intermediate layer, protective 
layer, subbing layer, backing layer, halation preventive layer, etc. 
The photographic material according to the present invention can be 
effectively applied for various uses such as for black and white in 
general, for X-ray, for color, for false color, for printing, for 
infrared, for micro and for silver dye bleaching. It is also applicable 
for the colloid transfer method, the silver salt diffusion transfer 
method, and the color image transfer method, the color diffusion transfer 
method or the absorption transfer method as disclosed in U.S. Pat. Nos. 
3,087,817, 3,185,567, and 2,983,606 of Rogers, U.S. Pat. No. 3,253,915 of 
Wayyarts, U.S. Pat. No. 3,227,550 of Whitemore, U.S. Pat. No. 3,227,551 of 
Barr, U.S. Pat. No. 3,227,552 of Whitemore and U.S. Pat. Nos. 3,415,644, 
3,415,645 and 3,415,646 of Land.

(EXAMPLES) 
The present invention is described in more detail by referring to the 
following examples. 
EXAMPLE-1 
A mono-dispersed core/shell emulsion was prepared as follows. While 
maintaining an aqueous solution containing gelatin at 50.degree. C., equal 
moles of an aqueous silver nitrate solution and an aqueous potassium 
bromide solution were added thereto simultaneously according to the 
control double jet method to obtain a 0.40 .mu.m cubic silver bromide 
emulsion. The resultant emulsion was chemically sensitized with addition 
of sodium thiosulfate and potassium chloroaurate. Using the emulsion thus 
obtained as the core, an aqueous silver nitrate solution and an aqueous 
potassium bromide solution were further added simultaneously to obtain a 
0.55 .mu.m cubic core/shell emulsion. The resultant core/shell emulsion 
was chemically sensitized with addition of sodium thiosulfate and 
potassium chloroaurate to obtain an emulsion, which is called Emulsion-A. 
A mono-dispersed core/shell Emulsion-B was prepared similarly as 
Emulsion-A. However, the core of Emulsion-B was 0.22 .mu.m cubic silver 
emulsion, which became 0.35 .mu.m when coated with the shell. 
To Emulsion-A and Emulsion-B were added each 90 mg/AgX mol of the 
sensitizing dye shown by the following Formula [S-1] to give 
green-sensitive emulsions. 
##STR8## 
Green-sensitive Emulsion-A and Emulsion-B were mixed at a ratio of 1:1 and 
an oil-protect dispersion of a magenta coupler 
1-(2,4,6-trichlorophenyl)-3-(2-chloro-5-octadecylsuccineimidoanilino)-5-py 
razolone was added to the mixture so that the above coupler became 0.25 mol 
per mol of silver halide, followed by addition of a film hardening agent, 
and the resultant composition was applied on a cellulose triacetate 
support so as to give a coated silver amount of 20 mg/100 cm.sup.2, and 
dried. The sample obtained is called Sample-1(Control). 
Another sample was prepared in the same manner as Sample-1, but in place of 
the above magenta coupler dispersion an oil-protective dispersion prepared 
with addition of a DIR exemplary compound (D-64) to the magenta coupler at 
a weight ratio of 5% based on the magenta coupler was used. The sample 
obtained is called Sample-2 (this invention). 
These samples were subjected to wedge exposure through a yellow filter by 
means of a sensitometer, and developed with a developing solution shown 
below at 30.degree. C. for 2, 3 and 4 minutes to prepare developped 
samples. 
______________________________________ 
4-Amino-3-methyl-N--ethyl-N--(.beta.- 
5 g 
methanesulfoneamidoethyl)aniline 
sulfate 
Sodium sulfite (anhydrous) 
2 g 
Sodium carbonate (monohydrate) 
15 g 
Potassium bromide 1 g 
Benzyl alcohol 10 ml 
Water Added to 1 liter 
(adjusted to pH 10.2 with potassium hydroxide) 
______________________________________ 
However, 30 seconds after initiation of development, the whole surface was 
exposed uniformly to white light of 1 lux for 30 seconds. Then, following 
the conventional procedure, bleaching, fixing, water washing were 
conducted followed by drying. 
For the magenta posi images obtained, the maximum density (Dmax), the 
minimum density (Dmin), shoulder gamma, foot gamma and gamma ratio were 
measured to obtain the results shown in Table 1. The shoulder gamma is 
represented by the absolute value of gamma connecting the density point of 
Dmin+(Dmax-Dmin).times.0.5 and the density point of 
Dmin+(Dmax-Dmin).times.0.8. The foot gamma is represented by the absolute 
value of gamma connecting the density point of Dmin+(Dmax-Dmin).times.0.2 
and the density point of Dmin+(Dmax+Dmin).times.0.5. The gamma ratio is 
represented as the value of shoulder gamma/foot gamma. 
TABLE 1 
______________________________________ 
Shoul- 
Develop- der Foot Gamma 
Sample ing time Dmax Dmin gamma gamma ratio 
______________________________________ 
Sample 1 
2' 1.27 0.10 0.46 0.62 0.74 
(Con- 3' 1.93 0.15 1.08 0.78 1.39 
trol) 4' 2.15 0.17 1.42 0.86 1.65 
Sample 2 
2' 1.22 0.09 0.64 0.69 0.93 
(Inven- 
3' 1.89 0.14 0.85 0.78 1.09 
tion) 4' 2.19 0.15 0.92 0.84 1.10 
______________________________________ 
As can be seen from the results of Table-1, the Sample-2 containing the DIR 
compound of the present invention exhibits smooth gradation characteristic 
with a gamma ratio which is approximate to 1.0. Further, when the 
developing time has changed, the Sample-1 of Control is fluctuated greatly 
in gamma ratio. In contrast, the Sample-2 of the present invention 
containing the DIR compound is small in fluctuation of gamma ratio. 
EXAMPLE-2 
Sample-1 and Sample-2 obtained in Example-1 were subjected to wedge 
exposure in the same manner as Example-1, developed with a developing 
solution with a recipe shown below at 30.degree. C. for 3 minutes, and 
then bleaching, fixing, water washing and drying were performed 
(Processing-1). 
______________________________________ 
4-Amino-3-methyl-N--ethyl-N--(.beta.- 
4.5 g 
methanesulfoneamidoethyl)aniline 
sulfate 
Sodium sulfite (anhydrous) 
5 g 
Sodium carbonate (monohydrate) 
40 g 
Potassium bromide 1 g 
5-Methylbenztriazole 10 mg 
Benzyl alcohol 10 ml 
1-Acetyl-2-phenylhydrazine 
0.2 g 
(fogging agent) 
Water added to 1 liter 
(adjusted to pH 12.0 with potassium hydroxide). 
______________________________________ 
Processing-2 was conducted in the same manner as the above Processing-1, 
but in Processing-2, the amount of 1-acetyl-2-phenylhydrazine in the 
developing solution in Processing-1 was increased from 0.2 g to 0.5 g. 
Processing-3 was conducted in the same manner as the above Processing-1, 
but in Processing-3 the amount of 5-methylbenztriazole a in the developer 
was increased from 10 mg to 50 mg. 
For the posi images obtained in the above Processing-1 to Processing-3, 
maximum density, minimum density and gamma value were measured to obtain 
the results shown in Table-2. The gamma value represents the absolute 
value of gamma connecting the density point of Dmin+(Dmax-Dmin).times.0.2 
and the density point of Dmin+(Dmax-Dmin).times.0.8. 
TABLE 2 
__________________________________________________________________________ 
Processing 1 Processing 2 Processing 3 
Gamma Gamma Gamma 
Sample 1 
Dmax 
Dmin 
value 
Dmax 
Dmin 
value 
Dmax 
Dmin 
value 
__________________________________________________________________________ 
Sample 1 
1.95 
0.15 
1.02 2.14 
0.15 
1.25 1.87 
0.14 
1.43 
(Con- 
trol) 
Sample 2 
1.91 
0.15 
0.92 1.94 
0.15 
1.00 1.88 
0.13 
0.93 
(Inven- 
tion) 
__________________________________________________________________________ 
As can be understood from the results in Table 2, the Sample-2 of the 
present invention containing the DIR compound exhibits stable photographic 
performance even when the processing liquor composition may be fluctuated. 
EXAMPLE-3 
A mono-dispersed core/shell emulsion was prepared as follows. While 
maintaining an aqueous solution containing gelatin at 40.degree. C., an 
aqueous ammonia solution containing silver nitrate and an aqueous solution 
containing potassium bromide were added simultaneously according to the 
control double jet method to obtain a 0.35 .mu.m cubic silver halide 
emulsion. Subsequently, after water-soluble salts were removed by washing 
with water, the emulsion was schemically sensitized with addition of 
sodium thiosulfate and potassium chloroaurate. Using the emulsion thus 
obtained as the core, an aqueous silver nitrate solution and an aqueous 
solution containing potassium bromide were further added to obtain a 0.52 
.mu.m tetrahedral silver bromide emulsion. The surfaces of the grains 
obtained were chemically sensitized with addition of sodium thiosulfate 
and potassium choroaurate. This emulsion is called Emulsion-C. 
Similarly to Emulsion-C, a 0.33 .mu.m tetrahedral silver bromide core/shell 
emulsion (Emulsion-D) was obtained. However, in this case, with a 0.24 
.mu.m silver bromide emulsion chemically sensitized was used as the core, 
and a silver bromide shell was further coated thereon, followed further by 
chemical sensitization of the surface to prepare the emulsion. 
To each of the Emulsion-C and a Emulsion-D prepared above, 90 mg of the 
sensitizing dye represented by Formula [S-2] shown below was added and the 
emulsions were mixed at a ratio of 1:1 to provide a red-sensitive 
emulsion. 
##STR9## 
After the sensitizing dye represented by the above Formula [S-1] was added 
to each of Emulsion-C and Emulsion-D prepared above, the emulsions were 
mixed at a ratio of 1:1 to provide a green-sensitive emulsion. 
Emulsion-C and Emulsion-D prepared above were mixed as such at a ratio of 
1:1 to provide a blue-sensitive emulsion. 
On a paper substrate laminated on both surfaces with polyethylene, the 
respective layers shown below were successively coated. 
(1) Red-sensitive emulsion layer 
This layer contains the above red-sensitive emulsion and 0.45 mol/AgX mol 
of an oil-protect dispersed cyan coupler 
2,4-dichloro-3-methyl-6-[.alpha.-(2,4-di-t-amylphenoxy)butylamido]phenol. 
(2) Intermediate layer 
This layer contains an oil-protect dispersed 2,5-di-t-octylhydroquinone. 
(3) Green-sensitive emulsion layer 
This layer contains the above green-sensitive emulsion and 0.25 mol/AgX mol 
of an oil-protect dispersed magenta coupler 
1-(2,4,6-trichlorophenyl)-3-(2-chloro-5-octadecylsuccineimidoanilino)-5-py 
razolone and a magenta coupler simultaneously with an oil-protect dispersed 
DIR exemplary compound (D-6). Here, the DIR compound was used in an amount 
of 5 wt.% based on the coupler. 
(4) Yellow filter layer 
This layer contains yellow colloid silver and an oil-protect dispersed 
2,5-di-t-octylhydroquinone. 
(5) Blue-sensitive emulsion layer 
This layer contains the above blue-sensitive emulsion and 0.45 mol/AgX mol 
of 
.alpha.-[4-(1-benzyl-2-phenyl-3,5-dioxo-1,2,4-triazolidynyl)]-.alpha.-piva 
ryl-2-chloro-5-[.alpha.-(2,4-di-t-amylphenoxy)butylamido]acetoanilide. 
(6) Protective film 
Gelatin layer. 
The sample obtained is called Sample-3 (this invention). 
Next, Sample-4 (Control) was prepared in the same manner as the above 
Sample-3 only except for adding no DIR compound in the green-sensitive 
emulsion layer. 
The Sample-3 and the Sample-4 obtained were exposed through a wedge and a 
chart for measurement of image sharpness, and then the same processing as 
Example-1 was conducted. However, in case of the developing time was 
changed to 3 minutes. The whole surface exposure was carried out under the 
conditions of (1) 0.5 lux, 20 sec, (2) 2.0 lux, 20 sec, (3) 8.0 lux, 20 
sec. However, in case of the samples for measurement of image sharpness 
the whole surface exposure was carried out only under the condition of 2.0 
lux and 20 sec. 
The gamma values of the respective samples obtained are shown in Table-3. 
Also, MTF (Modulation Transfer Function) was determined by a 
microdensitometer and the MTF values at space frequency of 5 lines/mm were 
compared. The results are also shown together in Table-3. 
TABLE 3 
______________________________________ 
Whole 
surface 
exposure Gamma value MTF value 
luminosity 
Yel- Ma- Yel- Ma- 
Sample (lux) low genta Cyan low genta Cyan 
______________________________________ 
Sample-3 
0.5 0.89 1.08 1.20 65 69 44 
(inven- 
2.0 0.97 1.14 1.22 
tion) 8.0 1.05 1.20 1.27 
Sample-4 
0.5 0.94 1.15 1.27 55 53 40 
(Con- 2.0 1.23 1.22 1.44 
trol) 8.0 1.34 1.51 1.84 
______________________________________ 
As can be seen from the results in Table 3, when the condition for whole 
surface exposure was varied, the Sample-3 of the present invention is 
small in fluctuation of gamma value to give a photograph of more stable 
quality. Further, it can be appreciated that the Sample-3 of the present 
invention has very high image sharpness. 
EXAMPLE-4 
When the same experiment as Example-3 was conducted for samples in which 
the DIR exemplary compound (D-6) in Sample-3 in Example-3 was changed to 
(D-11), (D-24), (D-66) and (D-72), good results equal to Example-3 could 
be obtained in any case. 
By constituting the internal latent image type direct posi color 
photographic material as in the present invention, a photographic material 
of said type, which is good in processing stability, has smooth gradation 
and also good in sharpness, can be produced with good reproducibility.