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PIXBGSTRIP(1)			    BRL-CAD			 PIXBGSTRIP(1)

NAME
       pixbgstrip - strip smooth shaded	background from	a pix(5) file

SYNOPSIS
       pixbgstrip [-a] [-t thresh] [-x x_offset_for_bg_pixel]
		  [-s squarefilesize] [-w file_width] [-n file_height]
		  [file.pix]

DESCRIPTION
       pixbgstrip reads	a pix(5) format	file from the named file, or from
       standard	input if no file is specified. For each	scanline read, all
       pixels that match the color of the background pixel are converted to
       black (0/0/0), and then the new scanline	is written on stdout.

       The default X offset for	the background pixel is	zero (i.e.  -x 0 ),
       but if the pixel	at X offset zero is not	the desired background (for
       example,	if a border exists around the actual image), then another
       offset can be specified.

       By default, a pixel will	be replaced with black only if it exactly
       matches the value of the	background pixel (i.e.,	the matching threshold
       is zero;	-t 0 ).	However, if the	background is slightly noisy, it may
       be necessary to perform a slightly looser matching. The threshold
       variable	specifies how large a difference between an input pixel	and
       the background pixel will still result in black being output.

       By default, the pix file	is assumed to be 512x512 pixels. Specifying
       the -a flag causes the program to attempt to autosize. A	table of
       common image sizes is consulted,	and if any match the size of the input
       file, then the width and	height values associated with that size	will
       be used.

       The -w file_width flag specifies	the width of each scanline in the
       input file, in pixels.

       The -n file_height flag specifies the height in scanlines of the	input
       file.

       -s squarefilesize sets both the height and width	to the size given.

SEE ALSO
       pixbackgnd(1), pix-fb(1), fb-pix(1), libfb(3), pix(5)

DIAGNOSTICS
       If the pix file is shorter than expected, the program exits silently.

AUTHOR
       BRL-CAD Team

COPYRIGHT
       This software is	Copyright (c) 1991-2019	by the United States
       Government as represented by U.S. Army Research Laboratory.

BUG REPORTS
       Reports of bugs or problems should be submitted via electronic mail to
       devs@brlcad.org

BRL-CAD				  03/02/2021			 PIXBGSTRIP(1)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | DIAGNOSTICS | AUTHOR | COPYRIGHT | BUG REPORTS

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