BWRECT(1)

bwrect - extract a rectangle from a black and white bw file

bwrect [-s squaresize] [-w width] [-n height] [-S out_squaresize] [-W out_width] [-N out_height] [-x xorig] [-y yorig] [-o out_file.bw] file.bw > [out_file.bw]

bwrect extracts a rectangular region from a black and white bw(5) format file. The default input image size is 512x512. The x,y coordinates of the origin (the default xorig=0, yorig=0 corresponds to the lower left corner) are passed as arguments for -x and -y.

The -w file_width flag specifies the width of each scanline in the input file, in pixels. -W scr_width does the same for the display device.

The -n file_height and -N scr_height flags specify the height in scanlines of the input file and display device respectively.

-s squarefilesize and -S squarescrsize set both the height and width to the size given (for input file and display device respectively).

(scr_width and scr_height must be set to positive values, either separately via -W and -N, or jointly via -S. This is because they start with default values of zero.)

-o out_file.bw is a way of specifying output file name.

This utility supports pipes and can read/write from/to them.

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

We ought to allow the questions to be answered on the command line so that shell scripts, etc., could use this.

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