Section: User Commands (1)
Updated: 20 Nov 1990Index
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ppmbrighten - change an images Saturation and Value from an HSV map
ppmbrighten [-n] [-s <+- saturation>] [-v <+- value>] <ppmfile>
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
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 supporting
documentation. This software is provided "as is" without express or
This program does not change the number of colors.
- SEE ALSO