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Mix together red and green and you will get yellow; mix green
and blue and result will be lightblue;
mix blue with red and you will get purple.
Note: if we are working on a computer, the
colors we see are radiated with light rays and there is no
relationship with the reflected colors we are accustomed to
(drawing with pastels or painting a house, for instance).
Mixing of the rays results in stronger lightness and tends
to white. Mixing of all three components generates white color.
Entering different values of them, you can get pink, orange,
scarlet and all of the
other colors. For example, getting pink, the following RGB
values must be entered: R - 255, G -
54, B - 92 (RGB values can be entered by percentage or number,
from 0 to 255). RGB model
consists of three color channels, each color represents one
channel.
In a whole, RGB mode is able to generate 256 hues of each
component (red, green and blue) and 256 gray hues.
Why 256?
A computer provides for each channel of the image a certain
quantity of bits. 1 bit is required for a monochrome image;
generating monochrome, computer uses maximum 2 colors(21=2).
It needs 8 bit for generating halftone image; 256 is the top
number of color gradations that 8 bits are able to produce
(28=256). It’s enough to generate all tints and shades of
gray color. Thus, each channel of the full-color image is
an 8 bit halftone image and the maximum number of color gradations
is 256.
The visible spectrum consists of billions of colors, and a
monitor may be able to display “true color” (16,000,000 colors),
although some older computer systems may be limited to 216
crossplatform colors. You might be surprised how you image
looks on a monitor with different luminiferous properties,
monitor’s gamma, and voltage its tubes use, or just on the
screen of those out-of-date models, etc. The color presentation
of your image can be changed while using different scanners
too.
Note: To be aware that RGB mode is really
screen-dependent, adjust brightness of your monitor.
You will note some changing of color without entering new
RGB values.
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