enlarge a portable bitmap with edge smoothing
see also :
pbmpscale N [
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portable bitmap as input, and outputs a portable bitmap
enlarged N times. Enlargement is done by pixel replication,
with some additional smoothing of corners and edges.
pbmpscale works best for enlargements of 2. Enlargements greater
than 2 should be done by as many enlargements of 2 as possible,
followed by an enlargement by the remaining factor.
1990 by Angus Duggan Copyright (C) 1989 by Jef
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