pamchannel(1) [redhat man page]

pamchannel(1)						      General Commands Manual						     pamchannel(1)

NAME

       pamchannel - extract channels from a PAM image

SYNOPSIS

       pamchannel [ -infile infile ] [channum] ...

       All options may be abbreviated to the shortest unique prefix.

DESCRIPTION

       Reads a PAM or PNM image as input.  Produces a PAM image as output, consisting of the indicated channels of the input.

       The  output  is the same dimensions as the input, except that the depth is the number of channum arguments you supply.  The tuple type is a
       null string.

OPTIONS

       -infile infile
	      This specifies the input file, which defaults to Standard Input.	You may specify - to select Standard Input explicitly.

	      This is a little unconventional for Netpbm programs, which usually have the input file specification as an argument.   For  pamchan-
	      nel, the arguments are channel numbers.

SEE ALSO

       pnm(5)

								  05 August 2000						     pamchannel(1)

pamtopnm(1)						      General Commands Manual						       pamtopnm(1)

NAME

       pamtopnm - convert PAM image to PBM, PGM, or PPM

SYNOPSIS

       pamtopnm [-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 ALSO

       pbmtopgm(1), pgmtopbm(1), pgmtoppm(1), ppmtopgm(1), pam(5), pnm(5), pbm(5), pgm(5), ppm(5)

								  03 August 2000						       pamtopnm(1)