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