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       gifbg  -  A  program  to  generate a single-color test pattern GIF with
       gradually changing intensity in any of the basic 8 directions.


       gifbg [-q] [-d Dir] [-l #Lvls] [-c R G B] [-m MinI] [-M MaxI] [-s W  H]

       The gifbg program reads no input, and will dump the created GIF file to




               Quiet mode.  Defaults off on MSDOS, on  under  UNIX.   Controls
              printout of running scan lines. Use -q- to invert.

       [-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

       [-l #Lvls]

               Number 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 (MinI) and maximum
              intensity  (MaxI)  from  one  end  of the screen to the other as
              defined by Dir.  See below (-m & -M) for MinI & MaxI. Default is
              Blue (0, 0, 255).

       [-m MinI]

               Minimum intensity (in percent) to scale color.  Default 10%

       [-M MaxI]

               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  MinI  ==  MaxI  = 100 (%) and #Lvls == 2 then boolean mask image of
       specified size will be created - all foreground.  This can be used as a
       square mask for the <a href="gifcomb.html">


       Gershon Elber

       Man  page  created by T.Gridel <>, originally written by
       Eric S. Raymond <>

                                 giflib-tools                         gifbg(1)