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ppmbrighten General Commands Manual ppmbrighten


ppmbrighten – change an images Saturation and Value from an HSV map


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


Reads a portable pixmap as input. Converts the image from RGB space to
HSV space and changes the Value by <+- value> as a percentage. Like‐
wise 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 (normal‐


pgmnorm, ppm(5)


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, pro‐
vided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in sup‐
porting documentation. This software is provided “as is” without
express or implied warranty.

This program does not change the number of colors.

20 Nov 1990 ppmbrighten

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