NAME

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

USAGE

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

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

MEMORY REQUIRED

       Line.

OPTIONS

       [-q]

               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 (North).

       [-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.

       [-h]

               Print one line of command line help, similar to Usage above.

NOTES

       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">

AUTHOR

       Gershon Elber

       Man page created by T.Gridel <tgridel@free.fr>, originally  written  by  Eric  S.  Raymond
       <esr@thyrsus.com>

                                           giflib-tools                                  gifbg(1)