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
-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
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
recognize 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