PPMDIM

NAME

      ppmdim - dim a portable pixmap down to total blackness

SYNOPSIS

      ppmdim dimfactor [ppmfile]

DESCRIPTION

      Reads a 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 brightness).
      As pnmgamma does not do the brightness correction in the way I wanted
      it, this small program was written.
      ppmdim is similar to ppmbrighten , but not exactly the same.

DEMONSTRATION

      Let a.ppm be a portable pixmap.
      The following command will dim it by a factor of 0.5:
	pnmmerge ppmdim 0.5 a.ppm > adim.ppm

BEFORE

AFTER

SEE ALSO

      ppm(5), ppmflash(1), pnmgamma(1), ppmbrighten(1)

AUTHOR

      Copyright (C) 1993 by Frank Neumann