NAME

bwthresh - threshold a black-and-white bw file

SYNOPSIS

bwthresh val... < file.bw

DESCRIPTION

bwthresh reads from standard input a stream of black-and-white data in bw(5) format and thresholds it among the vals, writing the resulting bw(5) data to standard output. The vals must appear on the command line in strictly increasing order.

The grey scale 0..255 is divided evenly into n+1 bins, and each pixel of input is compared to the vals, to determine which of the n+1 grey levels should be output.

EXAMPLE

The command

bwthresh 37 143 < file.bw > file2.bw

performs the following mapping:

if (pixel_in < 37) pixel_out = 0 else if (pixel_in < 143) pixel_out = 128 else pixel_out = 255

AUTHOR

BRL-CAD Team

COPYRIGHT

BUG REPORTS

Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org