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In8Photography |
Color photography was explored
throughout the 1800s. Initial experiments in color could not fix the
photograph and prevent the color from fading. Moreover until the 1870s the
emulsions available were not sensitive to red or green
light.
The first permanent color
photo was taken in 1861 by the physicist James Clerk Maxwell. Several
patentable methods for producing images (by either additive or subtractive
methods, see below) were devised from 1862 on by two French inventors
(working independently) Louis Ducos du Hauron and Charles Cros (see Coe,
ref 1, for details). Practical mehods to sensitise silver halide film to
green and then orange light were discovered in 1873 and 1884 by Hermann W.
Vogel. (Full sensitivity to red light was not achieved until the early
years of the 20th century.)
Source : wikipedia
All
text is available under the terms of the GNU Free
Documentation
license
Article |
|
The first fully practical
color film, Autochrome,
did not reach the market until 1907. It was based on a screen-plate
method, the plate being made using dyed dots of potato starch. The screen
plate lets filtered red, green or blue light through each grain to a
photographic film in contact with it. This is then developed to a
negative, and reversed to a positive, which when viewed through the screen
plate restores the original colours in their correct
proportions.
Other systems of color
photography included that invented by Sergei Mikhailovich
Prokudin-Gorskii, which involved three separate monochrome exposures
('separation negatives') of a still scene through red, green, and blue
filters.
The first modern
('integrated tri-pack') color film, Kodachrome, was introduced in 1935
based on three colored emulsions. Most modern color films, except
Kodachrome, are based on technology developed for Agfacolor (as 'Agfacolor
Neue') in 1936. (In this newer technology the colour-couplers are already
within the emulsion layers, rather than having to be carefully diffused in
during development.) Instant color film was introduced by Polaroid in
1963.
Source : wikipedia
All
text is available under the terms of the GNU Free
Documentation license
Article |

Justin
Grant |
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Justin
Price |
There are basically two
colour systems.
- (1)Additive. The colours
are added as coloured lights.Red,Green and Blue. Clark Maxwell's
experiment was of this type, as are screen-plate methods, such as
Autochrome. Modern digital photographs seen on a VDG are also viewed by
addition of light from an RGB phosphor array.
- (2)The other system is
subtractive using the secondary colours Cyan, Magenta and Yellow, which
are subtracted from white light. Several print methods were devised
using this technique during the 1930s (see eg Coe, ref 1), for printing
from 'separation negatives'. Kodachrome was the first
commercially-available 'integrated tri-pack' film of this type.
-
-
Source :
wikipedia
All text is available under the terms of the
GNU Free Documentation
license
Article |
|
Photography is the process of making
pictures by means of the action of light. It involves recording light
patterns, as reflected from objects, onto a sensitive medium through a
timed exposure. The process is done through mechanical, chemical or
digital devices commonly known as cameras.
The word comes from the
Greek words φως phos ("light"), and γραφις graphis
("stylus", "paintbrush") or γραφη graphê, together meaning "drawing
with light" or "representation by means of lines" or "drawing."
Source : wikipedia
All
text is available under the terms of the GNU Free
Documentation license
Article |

David
Fish |
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