Quote:
Originally Posted by HarryT
It is if the source file contains fewer than 256 colours. Maps in fantasy novels tend to be either monochrome, or else black and white with a very limited palette of additional colours, and hence will compress losslessly in GIF format. Line drawings (which maps typically are) are the ideal candidate for GIF compression.
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The map was a color map, and it probably had more than 256 colors (there were color gradients).