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FB-PNG(1)			    BRL-CAD			     FB-PNG(1)

NAME
       fb-png -	save a framebuffer image in a color Portable Network Graphics
       (PNG) file

SYNOPSIS
       fb-png [-ic] [-#	nbytes/pixel] [-g gamma] [-F framebuffer]
	      [-s squaresize] [-w width] [-n height] [file.png]

DESCRIPTION
       fb-png will take	a region of a framebuffer display and save it as a
       color png format	file. The environment variable FB_FILE is used to
       select the display device (see brlcad(1)). If this variable is not set,
       the default device for your system will be used.	Alternatively, the
       framebuffer may be explicitly specified by using	the -F flag.

       By default, the output png file,	and the	requested framebuffer size, is
       assumed to be 512x512 pixels. The -s flag will set both the file	height
       and width to be the given size, while -w	and -n are used	for setting
       them individually.

       A first quadrant	coordinate system is used (origin in lower left	of
       screen),	and the	area saved is normally from this origin. The -i	flag
       switches	to a fourth quadrant system, both in the storage order as well
       as the origin offset coordinates	(i.e. origin is	now the	upper left
       corner of the screen).

       The -# nbytes/pixel flag	specifies the number of	bytes per pixel. The
       only values accepted are	1 and 3.

       The -c flag specifies that the color map	in the frame buffer should be
       applied to the pixel values (crunched) before they are written to the
       output file.

       The -g gamma flag sets the specified gamma correction value into	the
       created PNG file. A value of 0.6	is a close approximation of PC display
       monitors. A negative gamma value	disables writing a gAMA	chunk out
       entirely	(and is	the default).

SEE ALSO
       brlcad(1), png-fb(1), fb-bw(1), pix(5)

AUTHOR
       John R. Anderson

COPYRIGHT
       This software is	Copyright (c) 1998-2019	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				  08/29/2020			     FB-PNG(1)

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

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