Unix Resources Post: 50669

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LEARN ABOUT MINIX

ppmdist

ppmdist(1)                                                    General Commands Manual                                                   ppmdist(1)

NAME

       ppmdist - simplistic grayscale assignment for machine generated, color images

SYNOPSIS

       ppmdist [-intensity|-frequency] [ppmfile]

DESCRIPTION

       Reads a portable pixmap as input, 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 program 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 repeti-
       tions).

OPTIONS

       -frequency    Sort input colors by the number of times a color appears in the input, before mapping to  evenly  distributed  graylevels  of
                     output.   -intensity  Sort input colors by their grayscale intensity, before mapping to evenly distributed graylevels of out-
                     put.  This is the default.

BUGS

       Helpful only for images with a very small number of colors.  Perhaps should have been an option to ppmtopgm(1).

SEE ALSO

       ppmtopgm(1), ppmhist(1), ppm(5)

AUTHOR

       Copyright (C) 1993 by Dan Stromberg.

                                                                   22 July 1992                                                         ppmdist(1)