Wednesday 19 February 2014

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What is RGB and CMYK mode in Photoshop

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.
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