What is RGB and CMYK
mode in Photoshop
Basically there are
two type of color mode. One is additive while other is subtractive. The monitor
or screen we use additive color and the printing press etc. uses subtractive
color mode.
What is additive color system?
Color
is composed of three basic colors that is red, green and blue. When we add
these three colors we can get all the possible colors. This is called additive
color system. Computer monitors and televisions are the most common examples of
additive color. Examination with a sufficiently powerful magnifying lens will
reveal that each pixel in CRT,LCD and most other types of color video displays
is composed of red, green and blue sub-pixels, the light from which combines in
various proportions to produce all the other colors as well as white and shades
of gray. The colored sub-pixels do not overlap on the screen, but when viewed
from a normal distance they overlap and blend on the eye's retina, producing
the same result as external superimposition.
What is subtractive color system?
Subtractive
color is just opposite of additive color system. It is the combination of light
that is reflected (that you can see) with the absorbed light (that you cannot
see).
In
the subtractive system, different-colored inks absorb different-colored light.
For example, cyan ink absorbs red light and reflects green and blue light back
at you, so you see a mix of green and blue—in other words, cyan. Similarly,
magenta ink absorbs green light and reflects red and blue light; in other
words, magenta. One last example: A mix of cyan, magenta, and yellow ink
absorbs most of the primary colors—red, green, and blue—so you see what’s left
over: dark brown.