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Ppmdist User Manual(0)                                  Ppmdist User Manual(0)

       ppmdist - simplistic grayscale assignment for machine generated, color images




       This program is part of Netpbm(1).

       ppmdist  reads  a  PPM  image  as  input  and  performs a simplistic grayscale assignment intended for use with
       grayscale or bitmap printers.

       Often conversion from ppm to pgm will yield an image with contrast too low for good printer output.   The  pro-
       gram maximizes contrast between the gray levels output.

       A  ppm  input  of  n colors is read, and a pgm of n gray levels is written.  The gray levels take on the values
       0..n-1, while maxval takes on n-1.

       The mapping from color to stepped grayscale can be performed in order of input pixel intensity, or input  pixel
       frequency (number of repetitions).

       This program is helpful only for images with a very small number of colors.

              Sort  input  colors  by  the number of times a color appears in the input, before mapping to evenly dis-
              tributed graylevels of output.

              Sort input colors by their grayscale intensity, before mapping to evenly distributed graylevels of  out-
              put.  This is the default.

       ppmtopgm(1), ppmhist(1), ppm(1)

       Copyright (C) 1993 by Dan Stromberg.

netpbm documentation             22 July 1992           Ppmdist User Manual(0)