Snapscreenshot

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:

Valkyrie at Grund's stronghold