BWSHRINK(1)

bwshrink - shrink a black and white bw file

bwshrink [-s squareinsize] [-w in_width] [-n in_height] [-f shrink_factor] [-u] [infile.bw] > outfile.bw

bwshrink will take a black and white bw(5) format file of given dimensions and produce a smaller scaled version. The -w and -n flags specify the input file width and number of scan lines in pixels. They can both be set to the same value via -s. Defaults of 512 are assumed for unspecified dimensions. The integer scaling factor is set with the -f flag. By default, the factor is 2.

The program reads the entire image into memory, and then scales the image down to 1/factor the original size in both dimensions.

By default, bwshrink uses boxcar averaging to produce the output pixels from the input. The -u option causes bwshrink to use image undersampling instead.

brlcad(1), bwcrop(1), bwrect(1), bwscale(1), bw(5)

If the dimensions of the input image are not evenly divisible by the shrink factor, incorrect and bizarre output is generated.

BRL-CAD Team

This software is Copyright (c) 1989-2021 by the United States Government as represented by U.S. Army Research Laboratory.

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