pgmnorm

normalizes contrast in PGM grayscale images

Normalize image contrast

$ pgmnorm [input.pgm] > [output.pgm]

Normalize with percentile

$ pgmnorm -bpercent [2] -wpercent [1] [input.pgm] > [output.pgm]

pgmnorm [options] [file]

pgmnorm normalizes contrast in PGM grayscale images. Stretches histogram to use full dynamic range. Part of Netpbm toolkit for image enhancement.

-bpercent n

Black percentile cutoff.

-wpercent n

White percentile cutoff.

-bvalue n

Black value.

-wvalue n

White value.