pnmscale(1)             UNIX System V(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.
















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