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ppmbrighten(1)                         General Commands Manual                        ppmbrighten(1)



NAME
       ppmbrighten - change an images Saturation and Value from an HSV map

SYNOPSIS
       ppmbrighten [-n] [-s <+- saturation>] [-v <+- value>] <ppmfile>

DESCRIPTION
       Reads a portable pixmap as input.  Converts the image from RGB space to HSV space and changes
       the Value by <+- value> as a percentage.  Likewise with the Saturation.  Doubling  the  Value
       would involve

       ppmbrighten -v 100

       to add 100 percent to the Value.

       The 'n' option normalizes the Value to exist between 0 and 1 (normalized).

SEE ALSO
       pgmnorm(1), ppm(5)

AUTHOR
       Copyright (C) 1990 by Brian Moffet Copyright (C) 1989 by Jef Poskanzer.

       Permission  to  use, copy, modify, and distribute this software and its documentation for any
       purpose and without fee is hereby granted, provided that the above copyright notice appear in
       all  copies and that both that copyright notice and this permission notice appear in support‐
       ing documentation.  This software is provided "as is" without express or implied warranty.

NOTES
       This program does not change the number of colors.



                                             20 Nov 1990                              ppmbrighten(1)