read a portable anymap and enlarge it N times
Reads a portable anymap as input.
Replicates its pixels
times, and produces a portable anymap as output.
can only enlarge by integer factors.
The slower but more general
can enlarge or reduce by arbitrary
can reduce by integer factors, but only for bitmaps.
If you enlarge by a factor of 3 or more, you should probably add a
step; otherwise, you can see the original pixels in the resulting image.
Copyright (C) 1989 by Jef Poskanzer.