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8187992
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2011-11-18T19:27:06.943
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Boy...I hope you loves your maths... This is a tough question. To determine the "closeness of fit" between two colors, you first must understand the color space/color model in which your are working. The RGB color model (not counting the alpha channel) is essentially Euclidean in nature: each color maps to a point in 3D space. Ergo, the putative distance between two colors, C1 and C2 is <blockquote><pre>Distance = SQRT( (C1red - C2red)2 + (C1green - C2green)2 + (C1blue - C2blue)2 )</pre></blockquote> WRT "normal" human visual perception, this is not necessarily correct. To take that into account gets much more complicated. Try these two papers as jumping-off points: <ul> <li><a href="http://www.compuphase.com/cmetric.htm" rel="nofollow">Colour Metric</a></li> <li><a href="http://www.poynton.com/ColorFAQ.html" rel="nofollow">The Color FAQ</a></li> </ul> The Color FAQ also provide many <a href="http://www.poynton.com/notes/links/color-links.html" rel="nofollow">links to other colorspace resource</a>s. Some more links at <a href="http://www.golden-gryphon.com/software/misc/color-links.html" rel="nofollow">http://www.golden-gryphon.com/software/misc/color-links.html</a> Here's a paper on color differences that might help also: <a href="http://www.axiphos.com/Reports/ColorDifferences.pdf" rel="nofollow">http://www.axiphos.com/Reports/ColorDifferences.pdf</a> <a href="http://brucelindbloom.com/" rel="nofollow">Bruce Lindbloom's web site</a> has lots of stuff as well, including a color difference calculator, that works in the CIE color space (which has provision for distance computations).
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1. POSetting every pixel in image to closest match from a list of Colors
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1. USNicholas Carey
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1. POSetting every pixel in image to closest match from a list of Colors
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