Thanks everyone for your suggestions.
Using one of the libraries recommended, I believe I can walk the directory, load each gif image and then loop through each pixel, changing all solid colors from e.g. blue (0,0,255) to green (0,255,00) .
But, as Anthony pointed out, I will have the problem of the text being antialiased.
Life could be simpler for you, if you have access to the original (presumably native Photoshop or Gimp format) files. You could simply write an automation script for PS or the Gimp to open each one, change the target colors in the appropriate layer(s), and then re-export the GIF.
BTW, the LZW patent expires Friday, so if you can wait a day, it will even be *legal* to use Gimp for this. ;-)
sherm--
"Though a program be but three lines long, someday it will have to be maintained."
-- The Tao of Programming
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