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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]
pnmscale -pixels n [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.
You can use the special -xysize flag, which fits the image
into the specified size without changing the aspect ratio.
Or, you can use the -pixels flag, which fits the image into
the specified number of pixels 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 3/1/94)