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pnmscale(1) Unix Programmer's Manual 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.
12 January 1991 1