The Houston daily post. [volume] (Houston, Tex.) 1886-1903, 1897-12-28
COLOR PHOTOGRAPHY.
Any Huc May Re Reproduced with
The Camera.

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The Camera.
ST. Louis Republic Special.
| New York. December 24.-For the frs
time in the history Of the world, colo
photography is a fact After working FOL
years, a way has been discovered by which
the hues Of nature can be reproduced with
only the aid of a camera
Professor j. S. Gibson is the man who
has made this possible, and the finished
that he can do everything he says he can.
For years Professor Gibson has been
working along the lines laid down by Pro-
fessor John Jolly of Trinity College, Dub
lin who first discovered the present sim
pie process. But Professor Gibson began
where Professor Jolly left of. and what
year ago was a curious scientific dis
coVery now is an everyday fact, within
the reach of every photographer.
1t is the simplicity OF the means used TO
reproduce colcrs that causes Professor Glib
son to feel such pride in his work All
needed beyond what is used by all photo
graphers are two screens. so called. or
glass plates. similar in appearance to those
used for taking negatives. But in these
screens lies the whole secret of the color
process. for each is covered with infinitely
fine lines OF the fundamental colors so
closely drawn as to be almost imperceptible
to the naked eye.
THE first OF these ! call the taking
screen said Professor Gibson cit is
placed in the camera directly i'll front OF
and in contact with the ohio chromatjc.
rms taking screen is Of greenish or yell
iowish- green and blue colors which are
paced IN alienation ON one side of the
glass.
These lines are sufficiently fine to blend
or be unobtrusiye TO the eve. and are 200
or more TO the inch
1Ine exposure of the plate for taking thu.
photosraph is made slightly longer than
usual with the same quality of plate. and
screen for preventing the ultra violet
rays OF the spectrum is used
The negative is developed as usual. ana
IRON 1t the positiyes are printed upon plasa
OF other Transparent support in the orii-
nary manner. When this Is done, both the
negative and the positive have the appear
ance OF being made In fine lines of shade
instead Of solid black and white This is
due to the filtering action of the lines nn,sn
the taking screen.
When the positive or printed picture is
ready. the photographer places upon it the
second screen, the viewing screen il Is
called. This screen is provided with lines
transmitting red, green and violet that is,
such light as Will excite the fundamental
color sensations.
This screen is placed upcn the printed
picture in such way that the lines of the
screen correspond to those Of the printed
picture. Then upon holding the two to the
ignt, the picture is seen in all its natural
colors These two plates are to be fastened
together. and when this is done they may
be used for stereopticon views. for hanging
in windows Of for albums.
The eye is unable to distinguish between
me yellow of the spectrum and yellow
formed by fixing proper amounts of red
and green light: the same Is true of the
sreetral blue and blue formed by mixing
proper amounts of the green and blue
Violet. And what is true of these colors--
yellow and blue Is true of every other
color Of the snccfrllnn -