index.txt
BBOX(9.1) BBOX(9.1) NAME bbox - compute bounding rectangle SYNOPSIS fb/bbox [ -s ] [ -cchannel ] [ -vvalue ] [ picture ] DESCRIPTION Bbox reads the given picture file (default standard input) and prints on its standard output the minimum bounding box of the interesting pix‐ els of the image. `Interesting' pixels are those for which a given channel, specified by the -c option, does not have a given value, spec‐ ified by the -v option. -v defaults to 0, and -c defaults to the α channel (letter 'a' in the CHAN= header line) if the image contains one, or the `m' channel otherwise. If the image has neither α nor `m', option -c is not optional. By default, therefore, bbox prints the bounding box of the visible parts of an image with an α channel, or the non-black parts of a monochrome image. Option -s causes bbox to instead copy its input to standard output, clipping the image to the bounding rectangle. SOURCE /sys/src/fb/bbox.c SEE ALSO picfile(9.6) BBOX(9.1)