plan9 man page for bbox

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
       pixels of the image.  `Interesting' pixels are those for which a given channel, specified by the -c option, does not have  a  given  value,
       specified by the -v option.  -v defaults to 0, and -c defaults to the a channel (letter 'a' in the CHAN= header line) if the image contains
       one, or the `m' channel otherwise.  If the image has neither a nor `m', option -c is not optional.  By default, therefore, bbox prints  the
       bounding box of the visible parts of an image with an a 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)