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[QUOTE=Marvin Mattelson]Allan,
Red and green are not true optical compliments. Close but no cigar. Using the principles of simultaneous contrast, if you place, for example, a red card against a white field the eye tries to balance out the color red with it's optical compliment. If the red card is removed there will be a blue green after image.
The Munsell color wheel is based on optical compliments: yellow-green and purple, blue-green and red, yellow-red and blue, red purple and green, and blue-purple and yell
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