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FBCMAP(1)			    BRL-CAD			     FBCMAP(1)

NAME
       fbcmap -	change the color map of	a frame	buffer

SYNOPSIS
       fbcmap [-h] [-F framebuffer] [- [sS] squarescrsize] [- [wW] scr_width]
	      [- [nN] scr_height] [map_number]

DESCRIPTION
       Fbcmap is used to change	the color map of a frame buffer. 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.

       The requested framebuffer size will be the default size for the
       selected	device (often 512x512 pixels). Specifying the -h flag changes
       the size	to 1024x1024.

       The -w~A scr_width and -W~A scr_width flags specifies the width of	each
       scanline	for the	display	device,	in pixels.

       The -n~A scr_height and -N~A scr_height flags specifies the height	of
       each scanline for the display device.

       -s~A squarescrsize and -S~A squarescrsize set both	the height and width
       to the size given. This size distinction	is important only for devices
       like the	Adage framebuffers which have different	operating modes	based
       on the display size.

       If an optional color map_number is given, that map is used; the default
       is the standard linear map. There are currently six other maps supplied
       numbered	1 through 6 as follows:

       1
	   reverse-linear (negative) map.

       2
	   one corrected for Polaroid 809/891 film.

       3
	   a linear mapping in which the first 100 values are black.

       4
	   a linear map	with values 1->191 incremented by 64 to	boost dim
	   pictures. The values	at 191 and above are all full on. Zero remains
	   at zero.

       5
	   a gamma correcting color map	used by	the University of Utah Alpha_1
	   project. A better source of gamma correction	is the fbgamma(1)
	   utility.

       6
	   a map with a	series of color	deltas.	This map is mostly black with
	   the following colors, appearing at multiples	of 32, having values
	   full	on: white (0), magenta (32), red (64), yellow (96), green
	   (128), cyan (160), blue (192). This map is most useful in
	   conjunction with fbcmrot(1) and will	show which pixels have the
	   same	intensities in one, two, or all	three color planes.

       There are also three special maps used to quickly change	the display to
       a solid color for adjusting a camera without losing image memory,
       numbered	10 through 12 for black, white,	and 18%	neutral	grey,
       respectively.

SEE ALSO
       brlcad(1), fbcmrot(1), fbgamma(1), cmap-fb(1), fb-cmap(1), cmap(5)

AUTHOR
       BRL-CAD Team

COPYRIGHT
       This software is	Copyright (c) 1986-2013	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				  07/08/2017			     FBCMAP(1)

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

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