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 speci-
       fied 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.

                                12 January 1991                    pnmscale(1)