Color names and the 10 elementary colors?

*To*: mathgroup at smc.vnet.net*Subject*: [mg67528] Color names and the 10 elementary colors?*From*: AES <siegman at stanford.edu>*Date*: Fri, 30 Jun 2006 04:13:47 -0400 (EDT)*Organization*: Stanford University*Sender*: owner-wri-mathgroup at wolfram.com

When I recently inquired about using the names of Mathematica colors ("CinnabarGreen", etc.) as label strings in a series of test plots, several responses proposed that I needed to manually input the names in quotes. Brian Higgins suggested, however, a terse but somewhat arcane way to get color names as strings together with the corresponding RGB values with the Input line allColorNames = ({#1, ToColor[ ToExpression[#1], RGBColor]}&) /@ AllColors; so that the Input allColorNames[[4]] produces the Output { Apricot, RGBColor[1., 0.340007, 0.129994] } (although his Output showed quotes around "Apricot" and mine doesn't.) Since my objective was to test all varieties of Green, I added to this a more crudely programmed statement to generate a list of all the green color names and color values, viz. allGreens={ }; Do[ If[ StringMatchQ[ allColorNames[[k,1]], "*Green*" ], AppendTo[ allGreens, allColorNames[[k]] ] ], {k, 1, Length[ allColorNames ]} ]; This works fine -- until you notice that just plain "Green" itself is not in the resulting list. In fact, Green (along with Red, Blue, Brown, Orange, and 4 or 5 other "elementary colors") is not in AllColors. I believe in earlier versions of Mathematica one had to use Graphics`Colors` to access even these elementary colors, and so they were presumably once included in AllColors (?); and I think I've learned somewhere that 10 or so of these elementary colors are now included within "plain Mathematica" and no long require calling the Graphics`Colors` package. But: 1) I'd sure like to understand the logic of not continuing to use these colors in AllColors nonetheless. Removing them seems a confusing and less than helpful choice to me at any rate. And, 2) Where -- or more important, how -- can the nonexpert user get at the list of these elementary colors? As a challenge, try invoking online Help on "Color" or "Colors" or any one of the elementary color names, and see if, using no more than 5 subsequent mouse clicks within the Help screen, no typing, and no pre-existing expert knowledge, just "common sense", you can find your way to the list of those colors.