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NAME
     bggen - generates colored backgrounds on X11 displays

SYNTAX
     bggen [-d display] [-g geometry] [-G rptgeom] [-r rot]  [-a]
     [-w  width] [-h height] [-b bits] <color-spec> [<color-spec>
     ...]

DESCRIPTION
     bggen is a  program  that  generates  a  rectangular  24-bit
     image,  with  a  smooth vertical gradient between the listed
     colors.  (If you only specify one color, the image will be a
     single  solid color.)  The top of the image will be in color
     (r1,g1,b1), and the bottom of the image  will  be  in  color
     (rn,gn,bn).   Intermediate positions in the image are inter-
     polated between these colors.  If you specify  more  than  2
     colors,  the  gradient  passes  through  all  the  specified
     colors, in the order specified.

     The '-d' option lets you specify what display to connect to.
     bggen  only  connects to the display to find out the size of
     the screen (and hence, the default size  for  the  generated
     image).

     The '-g' option lets you control the size of the image, as a
     standard  X  geometry  specification.   (ie,  something like
     "512x348")

     The '-G' option lets you control the tile size, as  a  stan-
     dard X geometry specification.  (ie, something like "32x32")
     Normally, (if you don't give  a  -G  option),  the  gradient
     fills  the  entire  image.   If you specify a -G option, the
     gradient will fill a portion of the image, and that  portion
     will be 'center-tiled' to fill the rest of the image.

     The '-r'  option  lets  you  rotate  the  gradient  counter-
     clockwise by the specified number of degrees.

     The '-a' option lets you force bggen to generate an image in
     PPM 'Ascii' format, rather than in PPM 'raw' format.

     The '-w' and '-h' options also let you set the size  of  the
     image.  They are provided only for backward compatibility.

     The '-b' option specifies the number of significant bits  in
     the  (output) color specifications.  It must range between 1
     and 8, inclusive.  Use values less than 8 (the  default)  to
     limit  color use by increasing the color granularity.  Since
     XV can do this sort of thing  better,  this  is  of  dubious
     value.


     A <color-spec> can be three integers  separated  by  spaces,
     forming  an  R,G,B triple ("0 255 0").  The values should be
     between 0 and 255.

     A <color-spec> can also be a standard X color  specification
     by  name  ("green") or value ("#00ff00").  This is decidedly
     easier, and the 'three integer' method  remains  mainly  for
     backward  compatibility.   One  note:   the '#' character is
     treated specially by many shells,  and  should  probably  be
     protected  by  putting  a  '\'  character in front of it, or
     wrapping the entire value with a pair of single-quotes.

     bggen doesn't  actually  affect  your  background  directly.
     bggen  merely  generates  a  PPM  (Portable  Pixmap  Format)
     datafile and dumps it to 'stdout'.  It's up  to  some  other
     program (such as XV) to read this file and display it.

     To use bggen, you should pipe its output into an XV command,
     such as:  "xv -root -quit -"

TRY THESE
     Light Blue to Dark Blue
          bggen 100 100 255  0 0 100  | xv -root -quit  -
     RGB Rainbow
          bggen red green blue | xv -root -quit -
     Green Cylinders
          bggen black green black -h 128 | xv -root -quit -
     Blue to Magenta
          bggen blue magenta | xv -root -quit -
     Full Rainbow
          bggen black red yellow green blue purple black | xv -root -quit  -
     Repeating Rainbow
          bggen red yellow green blue purple red -h 256 | xv -root -quit -
     Green Tiles
          bggen green black  -r 30 -g 32x32 | xv -root -quit -
     Red Balls
          bggen red black -r 45 -g 32x32 | xv -root -quit -rmode 3 -
     Red+Yellow Diamonds
          bggen red yellow  -r 45 -g 32x32 | xv -root -quit -rmode 3 -

AUTHOR
     John Bradley  -  bradley@dccs.upenn.edu

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