Snapscreenshot is a handy tool for Linux users who run NetHack or any of its variants on the console instead of using a terminal in X. It translates the colored ANSI characters to a screenshot in TARGA format.
The program can be found here as downloadable source code.
For an example of what the result looks like, check out this screenshot of a Valkyrie in SLASH'EM at Grund's stronghold:
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