As explained in "Color-Name Dictionaries", the Resene and NBS-ISCC dictionaries have higher quality than the other web-published dictionaries. Is it possible to use this improved color dictionary with existing programs?
GNU-Emacs and existing X11 programs depend on rgb.txt color names; so simply replacing rgb.txt is unwise. In X11, the last definition of a color-name in rgb.txt overrides earlier ones; I am assuming that GNU-Emacs (when not running under X11) treats rgb.txt in the same way.
The instructions which follow detail how to append the Resene colour name dictionary to the distributed rgb.txt. I am unaware of a method to define a private color dictionary on these platforms.
http://people.csail.mit.edu/jaffer/Color/resene.pdf is a catalog of the 1383 Resene paint colours.
The colors violet, plum, chocolate, lavender, ForestGreen, SaddleBrown, maroon, SpringGreen, coral, PowderBlue, linen, seashell, aquamarine, and azure are visibly different from the rgb.txt colors they override.
http://people.csail.mit.edu/jaffer/Color/resene-2010.pdf is a catalog of the updated Resene paint colours compared with the 2001 versions.
http://people.csail.mit.edu/jaffer/Color/nbs-iscc.pdf is a catalog of the 267 NBS-ISCC centroid colors.
The colors DarkGreen, DarkOliveGreen, black, DarkBlue, DarkGray, LightBlue, white, PaleGreen, LightGray, LightGreen, LightYellow, DeepPink, LightPink, DarkViolet, and DarkRed override the same-named X11 colors.
The NBS-ISCC centroid and Resene color dictionaries have no names in common.
rgb.txt is deprecated, sorry. The default upstream is to build without support for it.There appears to be no way to install a better color dictionary without modifying and rebuilding X11.
Your distribution may choose to do otherwise, of course, but that's not for X.org to enforce.
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