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RedHat 9 (Linux i386) - man page for ppmflash (redhat section 1)

ppmflash(1)						      General Commands Manual						       ppmflash(1)

ppmflash - brighten a picture up to complete white-out
ppmflash flashfactor [ppmfile]
Reads a portable pixmap as input. Increases its brightness by the specified flashfactor up to a total white-out image. The flashfactor may be in the range from 0.0 (original picture's brightness) to 1.0 (full white-out, The Second After). As pnmgamma does not do the brightness correction in the way I wanted it, this small program was written. This program is similar to ppmbrighten , but not exactly the same.
ppm(5), ppmdim(1), pnmgamma(1), ppmbrighten(1)
Copyright (C) 1993 by Frank Neumann 16 November 1993 ppmflash(1)