read a portable anymap and enlarge it N times
see also :
pbmreduce - pnmscale - pnmsmooth
add an example, a script, a trick and tips
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... Feel free to add your own example above to help other Linux-lovers !
portable anymap as input. Replicates its pixels N
times, and produces a portable anymap as output.
can only enlarge by integer factors. The slower but more
general pnmscale can enlarge or reduce by arbitrary
factors, and pbmreduce can reduce by integer factors,
but only for bitmaps.
If you enlarge
by a factor of 3 or more, you should probably add a
pnmsmooth step; otherwise, you can see the original
pixels in the resulting image.
pnmscale , pnmsmooth , pnm
1989 by Jef Poskanzer.