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Differentiate between RGB and CMYK color models.

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•RGB is based on projecting. Red light plus Green light plus blue light all projected together create white. Black is encoded as the absence of any color. 
•CMYK is based on ink.  Superimpose Cyan ink plus Magenta ink plus Yellow ink, and you get black, although this format also encodes Black (K) directly. White is encoded by the absence of any color.
•Prism uses RGB internally. Exporting in RGB will give you results very close to what you see on screen.
•Even though it uses one more number to encode a color, the CMYK scheme encodes a smaller "color space" than does RGB.
•When a color is converted from RGB to CMYK, the appearance may change. Most noticeably, bright colors in RGB will look duller and darker in CMYK as shown below (from here). You'll find a more elaborate comparison here.

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