dim a portable pixmap down to total blackness
see also :
ppmflash - pnmgamma - ppmbrighten
add an example, a script, a trick and tips
no example yet ...
... Feel free to add your own example above to help other Linux-lovers !
portable pixmap as input. Diminishes its brightness by the
specified dimfactor down to total blackness. The dimfactor
may be in the range from 0.0 (total blackness, deep night,
nada, null, nothing) to 1.0 (original picture’s
pnmgamma does not do the brightness correction in the
way I wanted it, this small program was written.
similar to ppmbrighten , but not exactly the
ppmflash , pnmgamma , ppmbrighten
1993 by Frank Neumann