pamtopnm(1)pamtopnm(1)NAMEpamtopnm - convert PAM image to PBM, PGM, or PPM
SYNOPSISpamtopnm [-assume] [pnmfile]
All options may be abbreviated to the shortest unique pre
fix.
DESCRIPTION
Reads a PAM image as input. Produces an equivalent PBM,
PGM, or PPM (i.e. PNM) image, whichever is most appropri
ate, as output.
pamtopnm assumes the PAM image represents the information
required for a PBM, PGM, or PPM image if its tuple type is
"BLACKANDWHITE", "GRAYSCALE", or "RGB" and its depth and
maxval are appropriate. If this is not the case, pamtopnm
fails.
However, you can override the tuple type requirement with
the -assume option.
As with any Netpbm program that reads PAM images, pamtopnm
also reads PNM images as if they were PAM. In that case,
pamtopnm's functions reduces to simply copying the input
to the output. But this can be useful in a program that
doesn't know whether its input is PAM or PNM but needs to
feed it to a program that only recognizes PNM.
OPTIONS-assume
When you specify -assume, you tell pamtopnm that
you personally vouch for the fact that the tuples
contain the same data as belongs in the channels of
a PBM, PGM, or PPM file. The depth must still con
form, though, so to truly force a conversion, you
may have to run the input through pamchannel first.
But be careful with -assume. When you -assume, you
make an -ass of u and me.
SEE ALSOpbmtopgm(1), pgmtopbm(1), pgmtoppm(1), ppmtopgm(1),
pam(5), pnm(5), pbm(5), pgm(5), ppm(5)
03 August 2000 pamtopnm(1)
