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 prefix.
DESCRIPTION
Reads a PAM image as input. Produces an equivalent PBM, PGM, or PPM
(i.e. PNM) image, whichever is most appropriate, 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 conform, 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)