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gifbg(1)                     GIFLIB Documentation                     gifbg(1)


       gifbg - generate a test-pattern GIF


       gifbg [-v] [-d dir] [-l lvls] [-c R G B] [-m min] [-o max] [-s w h]


       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


           Verbose mode (show progress). Enables printout of running scan

       -d dir
           Select direction the intensity of the background should increase.
           Direction can be one of the 8 principal directions:

               for Top

               for Top Right

               for Right

               for Bottom Right

               for Bottom

               for Bottom Left

               for left

               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

       -l lvls
           Numeric, nmber of levels the color will be scaled to. Default is

       -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.

           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.


       Gershon Elber.

GIFLIB                            2 May 2012                          gifbg(1)

giflib 5.2.1 - Generated Tue Jan 19 15:23:57 CST 2021
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