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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
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