Reads a HIPS file as input. Produces a portable graymap as output.
If the HIPS file contains more than one frame in sequence, hipstopgm
will concatenate all the frames vertically.
HIPS is a format developed at the Human Information Processing Labora-
Copyright (C) 1989 by Jef Poskanzer.
24 August 89 hipstopgm(1)
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