fstopgmSection: User Commands (1)
Updated: 06 April 89
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NAMEfstopgm - convert a Usenix FaceSaver(tm) file into a portable graymap
DESCRIPTIONReads a Usenix FaceSaver(tm) file as input. Produces a portable graymap as output.
FaceSaver(tm) files sometimes have rectangular pixels. While fstopgm won't re-scale them into square pixels for you, it will give you the precise pnmscale command that will do the job. Because of this, reading a FaceSaver(tm) image is a two-step process. First you do:
fstopgm > /dev/nullThis will tell you whether you need to use pnmscale. Then use one of the following pipelines:
fstopgm | pgmnorm fstopgm | pnmscale -whatever | pgmnormTo go to PBM, you want something more like one of these:
fstopgm | pnmenlarge 3 | pgmnorm | pgmtopbm fstopgm | pnmenlarge 3 | pnmscale <whatever> | pgmnorm | pgmtopbmYou want to enlarge when going to a bitmap because otherwise you lose information; but enlarging by more than 3 does not look good.
SEE ALSOpgmtofs(1), pgm(5), pgmnorm(1), pnmenlarge(1), pnmscale(1), pgmtopbm(1)
AUTHORCopyright (C) 1989 by Jef Poskanzer.
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