fstopgm man page

fstopgm — convert a Usenix FaceSaver(tm) file into a PGM image


fstopgm [fsfile]


fstopgm reads a Usenix FaceSaver(tm) file as input and produces a PGM image 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 pamscale command that will do the job. Because of this, reading a FaceSaver(tm) image is a two-step process. First you do:

fstopgm > /dev/null

This will tell you whether you need to use pamscale.

Then use one of the following pipelines:

fstopgm | pnmnorm
fstopgm | pamscale -whatever | pnmnorm

To go to PBM, you want something more like one of these:

fstopgm | pamenlarge 3 | pnmnorm | pamditherbw
fstopgm | pamenlarge 3 | pamscale <whatever> | pnmnorm | pamditherbw

You want to enlarge when going to a bitmap because otherwise you lose information; but enlarging by more than 3 does not look good.

FaceSaver is a registered trademark of Metron Computerware Ltd. of Oakland, CA.

See Also

pgmtofs(1) , pgm(1) , pnmnorm(1) , pamenlarge(1) , pamscale(1) , pamditherbw(1)


Copyright (C) 1989 by Jef Poskanzer.

Document Source

This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at


Referenced By


Explore man page connections for fstopgm(1).