pnmscale

scale a portable anymap

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4
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jpegtopnm foo.jpg | ppmtopgm | pnmscale .25

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2
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pnmscale -xysize 2400 3000 image.pgm | pgmtopbm -hil | pnmtops -scale 0.25 > image.ps

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0
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fstopgm | pnmenlarge 3 | pnmscale <whatever> | pgmnorm | pgmtopbm

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0
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fstopgm | pnmscale -whatever | pgmnorm

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