Iowa County democrat. [volume] (Mineral Point, Wis.) 1877-1938, 1893-07-14


colors?'
Il can, but it is difficult and experia-
i've process. Besides, the results are not
nearly so beautiful as I can get with
the heliochromoscope and / have pre-
ferred to devote the greater part OF
my attention to reproducing them I'm
this way. The Washington Museum
possesses set Of lantern slides in COL
ors which L gave them. These were
made by printing ON gelatine and &C.
menting the three images in layers fr
a particular way; the color was not
touched by hand"
Can any one take colored photo
graphs by your process, or does the
apparatus need special adjustments"
None whatever. You take photo
graphs In the ordinary manner and
PRINT In the ordinary manner, except
that for purposes of heliochromy you
print on to glass instead of paper. Here
Is my camera attachment The light
which comes from the object is split
up automa tically by an ARRANGEMENT Of
transparent mirrors, so that part goes
TO a circle covered by red screen
part to one covered by a green screen
and part to another covered by a blue
screen.
My Photographic screens" he said.
are based upon Maxwells diagram
or the curves of color sensation. The
most remarkable fact shown by this
diagram is that the rays which repre-
sent fundamental color sensation are
xx,1,f
excite that sensation. The red sensa-
non Is excited by the spectrum rays
from red to green, but most power
fully by the orange. Thus. in order
to get the effect of the red sensation
ON my negative, I must use not a SIM
pie red glass, but one which will adj
NIT Gn definite proportionS) the red.
orange, yellow and yellow green spect-
rum rays. Similarly, to get the effects
of the green sensation, 1 must admit
on to my negative the joint action
of the orange, yellow, yellow-green and
grean-blue spectrum rays, but only
in proportion to their power to excite
that sensation. So with the blueviolet
Allowance is, Of course.
made for the difference In constituencies
OF the eye and the Photographic plate.
No one has attempted to do this before,
and that is where my work differs so
widely from that Of the French people,
who have proceeded on these lines.
They have simply been content to Use
the ordinary red, green and blue violet
screens to produce the effect"
I'm concentrating the three images
back again into one image do you use
the same colored screens?"
mp, that Is rather strange For
this purpose the pure colors must be
used, which represent the fundamental
'1The heliochromoscope is arranged
like the reverse of your camera, I
"Practically 1t Is. | use q pure col
ored screen to each image, and the
three images are superimposed at one
focus by means of an arrangement of
mirrors The three rays, so to speak.
are interfered with by the lights and
shades on the Photographic plate,
through which the light passes, and
the composite effect of these interfer-
ences is to produce the original colors
of the object photographed. You will
see, if no plate intewencs, the rays
passing through are three colored
screens of the heliochromoscope pro-
duce a white disc merely"
Does your camera reproduce every
color and shade in nature?'
Certainly. That is more than the
process can claim. Or less,
perhaps I should say; for the Lipp-
mann process is certain to photograph
in colors, whether the object is colored
or not. My camera does not do that.
Here is a photograph Of an ordinary
photograph pasted on to bands of
bright colors; you see the photograph
remains in brown monochrome while
the bands are bright One photogra phic
worthy has described my process as
looking at ordinary photographs
through cOlOred glass. / can't think
why people should wish to detract
from it. 1t is a perfectly honest scien-
tific process, and I have not forced it
on them. Since Captain Abney and
others Of the leading scientists have
taken it up, however, this pettiness
has ceased"
'Is color photography your prinei-
pal work?'
mo; it has been little more than one
Of my favorite hobbies. I am best
known i'm America as the inventor Of
the first successful system of half-tone
block engraving
"Why do you call your. process Of
color photography by such long
name?"
Because, popularity speaking, 1t is
not color photography at all, and I do
not wish to m1slead. Color photography
in the sense Of reproducing directly the
colors Of nature in camera l believe
TO be an impossibility; and certainly
no such picture has ever been produced
Besides Lippmann's results, l have
seen hand-painted affairs masquerading
rs color photographs, and In Paris I
went to see some marvellous results
which I had read about in three col
umns Of fulsome print, and found they
were nothing but lithochrome repl0-
uctions from collotype plates, touched
up by hand / would not go yard
aside to see a 'colored photograph
now"
FADS OF THE SEASON.