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pnmenlarge can only enlarge by integer factors. The slower but more general pnmscale pnmscale can enlarge or reduce by arbitrary factors, and pbmreduce 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 pnmsmooth step; otherwise, you can see the original pixels in the resulting image.
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