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Shell Programming and Scripting
UNIX Join not working as expected
Post 302970581 by venkat_reddy on Friday 8th of April 2016 09:47:40 AM
04-08-2016
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LEARN ABOUT REDHAT
pamstack
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 output, 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. 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 -tuple- type 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 informa- tion -- tuple type "RGBA". In Netpbm, such images were traditionally represented as two images - a PPM for the color and a PGM for the transparency. To convert a PPM/PGM pair into PAM(RGBA) input that newer programs require, do something like this: pamstack -tupletype=RGBA myimage.ppm myalpha.pgm | pamtouil >myimage.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 recog- nize 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)