RGB means :Red, Green, Blue is an additive color mode. It is called additive because the background of screen is black. Then light up in varying intensity adding light to black. The variations in intensity of each color determines what color the user sees. CMYK means :Cyan, Magenta, Yellow, Key or black is subtractive because the paper where its printed on is white and the ink subtracts from the brightness of the white paper. CMYK also uses secondary colors that are much lighter than those used in RGB because to reproduce the darker colors, you would only need to add more ink.
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