GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
Debian 6.0.3(Squeeze) |
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fstopgm(1) |
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fstopgm - convert a Usenix FaceSaver(tm) file into a portable graymap
fstopgm [fsfile]
Reads 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/null
This will tell you whether you need to use pnmscale.
Then use one of the following pipelines:
fstopgm | pgmnorm
fstopgm | pnmscale -whatever | pgmnorm
To go to PBM, you want something more like one of these:
fstopgm | pnmenlarge 3 | pgmnorm | pgmtopbm
fstopgm | pnmenlarge 3 | pnmscale <whatever> | pgmnorm
| pgmtopbm
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.
pgmtofs(1), pgm(5), pgmnorm(1), pnmenlarge(1), pnmscale(1), pgmtopbm(1)
Copyright (C) 1989 by Jef Poskanzer.
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fstopgm(1) | |