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Light vs. Ink
Colors created by glowing dots are not quite the same as those created by ink on the printer. Screens use the RGB system described above. Inks use the CMYK system using the colors C yan (a kind of blue), M agenta (a kind of red), Y ellow, and blac K. This is why what you see on your screen is not quite the same color when you print. Physics Lesson: Color from mixing lights: Lights show the colors that the light source sends out (emits). The colors from different light sources are added together to make the color that you see. A computer screen uses this process. The primary colors for lights are red, green, and blue-violet. Mixed together, they can produce all the other colors. Color from optical mixing: The illusion of color can be created by tricking the eye. Artists of the Impressionist period created paintings using only dots of color. Newspaper photos are made of dots, also. The human eye blends the colors to "see" shapes and colors that were not actually drawn with lines, just suggested by the dots.
Fun site! - Learn more from the University of Colorado, using interactive Java applets. (Java applets take a while to load. You will be happier if you have a fast computer and a fast Internet connection.) The Big Picture CRT screens LCD screens
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