gifbg(1) GIFLIB Documentation gifbg(1)
NAME
gifbg - generate a test-pattern GIF
SYNOPSIS
gifbg [-v] [-d dir] [-l lvls] [-c R G B] [-m min] [-o max] [-s w h]
[-h]
DESCRIPTION
A program to generate a single-color test pattern GIF with gradually
changing intensity in any of the basic 8 directions.
The gifbg program reads no input, and will dump the created GIF file to
stdout.
OPTIONS
-v
Verbose mode (show progress). Enables printout of running scan
lines.
-d dir
Select direction the intensity of the background should increase.
Direction can be one of the 8 principal directions:
"T"
for Top
"TR"
for Top Right
"R"
for Right
"BR"
for Bottom Right
"B"
for Bottom
"BL"
for Bottom Left
"L"
for left
"TL"
for Top Left
The compass directions may be use as synonyms for the above
directions, so for example "NE" is equal to "TR".
Direction is case insensitive. The default direction is Top
(North).
-l lvls
Numeric, nmber of levels the color will be scaled to. Default is
16.
-c R G B
What to use as the primary background color to scale. This color is
scaled between the minimum intensity (min) and maximum intensity
(max) from one end of the screen to the other as defined by dir.
See below (-m & -M) for min & max. Default is Blue (0, 0, 255).
-m min
Minimum intensity (in percent) to scale color. Default 10%
[-M max
Maximum intensity (in percent) to scale color. Default 100%
-s W H
Size of image to create. Default 640 by 350.
-h
Print one line of command line help, similar to Usage above.
If min == max = 100 (%) and lvls == 2 then boolean mask image of
specified size will be created - all foreground.
AUTHOR
Gershon Elber.
GIFLIB 2 May 2012 gifbg(1)
giflib 5.2.1 - Generated Tue Jan 19 15:23:57 CST 2021