pamstack(1) General Commands Manual pamstack(1) 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. DESCRIPTION Reads multiple PAM or PNM images as input. Produces a PAM image as out- put, consisting of all the planes (channels) of the inputs, stacked in the order specified. 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. pam- stack fails if the inputs are not all the same width, height, and max- val. The tuple type is a null string unless you specify the -tupletype option. pamchannel does the opposite of pamstack: It extracts individual planes from a single PAM. Use pamtopnm to convert a suitable PAM image to a more traditional PNM (PBM, PGM, or PPM) image. One example of using pamstack is that some Netpbm programs accept as input a PAM that represents graphic image with transparency information -- tuple type "RGBA". In Netpbm, such images were traditionally repre- sented as two images - a PPM for the color and a PGM for the trans- parency. To convert a PPM/PGM pair into PAM(RGBA) input that newer pro- grams require, do something like this: pamstack -tupletype=RGBA myimage.ppm myalpha.pgm | pamtouil >myim- age.uil OPTIONS -tupletype tupletype This specified the tuple type name to be recorded in the output. You may use any string up to 255 characters. Some programs rec- ognize some names. If you omit this option, the default tuple type name is null. SEE ALSO pam(5) AUTHOR Copyright (C) by Bryan Henderson, San Jose CA 2000.08.05 01 May 2002 pamstack(1)
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