Annotated edit history of
pnmdepth(1) version 1, including all changes.
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pnmdepth |
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!!!pnmdepth |
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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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pnmdepth - change the maxval in a portable anymap |
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!!SYNOPSIS |
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__pnmdepth__ ''newmaxval'' |
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[[''pnmfile''] |
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!!DESCRIPTION |
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Reads a portable anymap as input. Scales all the pixel |
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values, and writes out the image with the new maxval. |
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Scaling the colors down to a smaller maxval will result in |
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some loss of information. |
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Be careful of off-by-one errors when choosing the new |
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maxval. For instance, if you want the color values to be |
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five bits wide, use a maxval of 31, not 32. |
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One important use of __pnmdepth__ is to convert a new |
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format 2-byte-per-sample PNM file to the older |
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1-byte-per-sample format. Before April 2000, essentially all |
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raw (binary) format PNM files had a maxval less than 256 and |
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one byte per sample, and many programs may rely on that. If |
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you specify a ''newmaxval'' less than 256, the resulting |
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file should be readable by any program that worked with PNM |
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files before April 2000. |
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!!SEE ALSO |
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pnm(5), ppmquant(1), ppmdither(1) |
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!!AUTHOR |
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Copyright (C) 1989, 1991 by Jef Poskanzer. |
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