Annotated edit history of
pnmarith(1) version 1, including all changes.
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pnmarith |
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!!!pnmarith |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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SEE ALSO |
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AUTHOR |
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---- |
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!!NAME |
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pnmarith - perform arithmetic on two portable anymaps |
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!!SYNOPSIS |
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__pnmarith |
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-add__|__-subtract__|__-multiply__|__-difference__|__-minimum__|__-maximum.__ |
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''pnmfile1 pnmfile2'' |
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!!DESCRIPTION |
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Reads two portable anymaps as input. Performs the specified |
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arithmetic operation, and produces a portable anymap as |
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output. The two input anymaps must be the same width and |
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height. |
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The arithmetic is performed between corresponding pixels in |
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the two anymaps, as if maxval was 1.0, black was 0.0, and a |
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linear scale in between. Results that fall outside of [[0..1) |
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are truncated. |
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The operator ''-difference'' calculates the absolute |
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value of ''pnmarith -subtract pnmfile1 pnmfile2,'' i.e. |
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no truncation is done. |
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All flags can be abbreviated to their shortest unique |
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prefix. |
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!!SEE ALSO |
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pbmmask(1), pnmpaste(1), pnminvert(1), pnm(5) |
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!!AUTHOR |
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Copyright (C) 1989, 1991 by Jef Poskanzer. Lightly modified |
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by Marcel Wijkstra |
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