pixrect — extract a rectangle from a color pix file
bwrect [-h ] [-s squaresize] [-w width] [-n height] [-W out_width] [-N out_height] [-x xorig] [-y yorig] [-S out_squaresize] [-o out_file.pix] file.pix > [out_file.pix]
Pixrect extracts a rectangular region from a colored pix(5) format file. The default input image size is 512X512. The x-y coordinates of the origin (xorig=0, yorig=0 corresponds to the lower left corner) and the dimension of the output image are passed as command line arguments.
This utility supports redirected input/output images.