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Pamstack User Manual(0) 						  Pamstack User Manual(0)

NAME
       pamstack - stack planes of multiple PAM images into one PAM image

SYNOPSIS
       pamstack [-tupletype tupletype] [inputfilespec ...]

       All  options  may  be  abbreviated to the shortest unique prefix.  You may use two hyphens
       instead of one.	You may separate an option from its value with a space instead of =.

DESCRIPTION
       This program is part of Netpbm(1)

       pamstack reads multiple PAM or PNM images as input and produces a  PAM  image  as  output,
       consisting of all the planes (channels) of the inputs, stacked in the order specified.

       For any one (but not more) of the input files, you may specify '-' to mean Standard Input.
       If you specify no arguments at all, the input is one file: Standard Input.

       The output is the same dimensions as the inputs, except that the depth is the sum  of  the
       depths  of  the inputs.	It has the same maxval.  pamstack fails if the inputs are not all
       the same width, height, and maxval.  The tuple type is a null string  unless  you  specify
       the -tupletype option.

       pamstack  works with multi-image streams.  It stacks the 1st image in all the streams into
       one output image (the first one in the output stream), then stacks the 2nd  image  in  all
       the  streams  into the 2nd image in the output stream, and so on, until one of the streams
       runs dry.  It's like a matrix operation.

       Before Netpbm 10.32 (February 2006), pamstack ignored all but  the  first  image  in  each
       input stream.

       pamchannel  does  the  opposite	of pamstack:  It extracts individual planes from a single
       PAM.

       Use pamtopnm(1)
	to convert a suitable PAM image to a more traditional PNM (PBM, PGM, or PPM) image.  (But
       there's	no  need to do that if you're going to feed it to a modern Netpbm program -- they
       all take suitable PAM input directly).

       One example of using pamstack is that some Netpbm programs accept as input a PAM that rep-
       resents	graphic  image	with transparency information.	Taking a color image for example,
       this would be a PAM with tuple type "RGB_ALPHA".  In Netpbm, such images  were  tradition-
       ally  represented  as two images - a PPM for the color and a PGM for the transparency.  To
       convert a PPM/PGM pair into PAM(RGB_ALPHA) input that newer programs require, do something
       like this:

       $ pamstack -tupletype=RGB_ALPHA myimage.ppm myalpha.pgm | \
	     pamtouil >myimage.uil

OPTIONS
       -tupletype tupletype
	      This  specifies  the tuple type name to be recorded in the output.  You may use any
	      string up to 255 characters.  Some programs recognize some names.  If you omit this
	      option, the default tuple type name is null.

SEE ALSO
       pam(1)

       pamchannel(1)

HISTORY
       pamstack was new in Netpbm 10.0 (June 2002).

netpbm documentation			 10 January 2006		  Pamstack User Manual(0)
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