fb-bw — save a framebuffer image in a black and white bw file
fb-bw [-i ] [-F framebuffer] [-X scr_xoff] [-Y scr_yoff] [-s squaresize] [-w width] [-n height] [file.bw]
fb-bw
will take a region of a framebuffer display and save it as a black and
white
bw(5)
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 file will be size 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
-X
and
-Y
flags can be used to move the origin to an offset position on the screen.
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).
An equal blending of red, green, and blue is done. For more complicated black and white conversion use fb-pix(1) and pix-bw(1).