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RE: function to get inverse color name?

From: Drew Adams
Subject: RE: function to get inverse color name?
Date: Thu, 24 Apr 2014 06:44:07 -0700 (PDT)

> I'm doing a major overhaul of my emacs 24 init.el files.  I'm trying to
> convert a lot of faces from dark to light to set up alternate themes.  I
> know I can just invert everything with invert-all-faces, but I want to do
> them individually and have the correct name.
> Does anyone have a function that takes a named color (e.g. "Red") and
> returns the inverse?  I guess it would convert the name to RRGGBB, subtract
> each 8-bit value from 256, and then convert back to a name.
> Thanks for any help and/or pointers to useful functions!

Library hexrgb.el has this (`hexrgb-complement') and many other such
utility functions for colors.

Library palette.el provides a WYSIWYG color palette for working with
colors.  In the palette, `~' picks the complement of the current color.

Both libraries are on Emacs Wiki and MELPA:

You can see the color palette here:

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