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quote:Originally posted by gsmollinI think I'm understanding McQueen's question now, and it is indeed a good one. Let me re-state it, as I understand it.We can form colors on a screen or page by mixing primary colors. The tri-tone primary colors are red, green, and blue for additive color mixing. So on a TV screen, we can look with a magnifying glass and see red green and blue dots or stripes on the screen being used to make up all the colors. There is quite a lot of information available on the web about this process, if we search on "NTSC color standard".The tri-tone primary colors are cyan, magenta, and yellow for subtractive color mixing. So we can mix these colors of paint or ink to get "con-tone" images, such as on a photographic print, or an artist's painting. Another application would be "spot" color from a printing press.Now we come to the question: Half-tone images are constructed of dots, much like the screen of a TV set or computer monitor. Why are the dots colored cyan, magenta, and yellow instead of red, green, and blue? Think before you answer! Each dot is separate from its neighbor, and the reflected light from each and every dot travels an independent path. So there is no color pigment or ink mixing, such as in a painted image or a photographic print. In addition, the dot sizes are very large, say .007 inches (.2 mm), so interference cannot be a significant issue. Why are the primary colors different, CMY, instead of RGB?