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1995-03-17
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pnmscale(1) AMIGA (12 January 1991) pnmscale(1)
NAME
pnmscale - scale a portable anymap
SYNOPSIS
pnmscale s [pnmfile]
pnmscale -xsize|-width|-ysize| -height s [pnmfile]
pnmscale -xscale|-yscale s [pnmfile]
pnmscale -xscale|-xsize|-width s -yscale|-ysize|-height s
[pnmfile]
pnmscale -xysize x y [pnmfile]
DESCRIPTION
Reads a portable anymap as input. Scales it by the
specified factor or factors and produces a portable anymap
as output. If the input file is in color, the output will
be too, otherwise it will be grayscale. You can both
enlarge (scale factor > 1) and reduce (scale factor < 1).
You can specify one dimension as a pixel size, and the other
dimension will be scaled correspondingly.
You can specify one dimension as a scale, and the other
dimension will not be scaled.
You can specify different sizes or scales for each axis.
Or, you can use the special -xysize flag, which fits the
image into the specified size without changing the aspect
ratio.
All flags can be abbreviated to their shortest unique
prefix.
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.
SEE ALSO
pbmreduce(1), pnmenlarge(1), pnmsmooth(1), pnm(5)
AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer.
Page 1 (printed 10/19/91)