NAME

       ppmpat - make a pretty PPM image

SYNOPSIS

       ppmpat  [{-gingham2|-g2}  |  {-gingham3|-g3}  | -madras | -tartan | -poles | -squig | -camo | -anticamo |
       -argyle1 | -argyle2] [-color colorlist] [-mesh] [-randomseed integer]

       width height

       You can abbreviate any option to its shortest unique prefix.

DESCRIPTION

       This program is part of Netpbm(1).

       ppmpat produces a PPM of the specified width and height, with a pattern in it.

       You could, for example, use it to create wallpaper for a computer screen.

       One use of this program is as an example of the Netpbm library drawing(1) functions, which it uses.

       Some of the patterns have large numbers of colors, so if you want a simpler pattern, use pnmquant on  the
       output.

OPTIONS

       In addition to the options common to all programs based on libnetpbm (most notably -quiet, see
        Common Options ⟨index.html#commonoptions⟩ ), ppmpat recognizes the following command line options:

   Pattern Specification
       Specify the pattern type with these options.  One pattern type must be specified.

       -gingham2 -g2
              A gingham check pattern.  Can be tiled.

              If you specify -color, give two colors: background and foreground, in that order.

       -gingham3 -g3
              A slightly more complicated gingham.  Can be tiled.

              If you specify -color, give three colors: background and two foregrounds, in that order.

       -madras
              A madras plaid.  Can be tiled.

              If you specify -color, give three colors: background and two foregrounds, in that order.

       -tartan
              A tartan plaid.  Can be tiled.

              If you specify -color, give three colors: background and two foregrounds, in that order.

       -poles Color gradients centered on randomly-placed poles: a Voronoi diagram.

              (There are many examples of this pattern in nature.  One is the hide of a giraffe).

              If you specify -color, give two or more colors.

       -squig Squiggley tubular pattern.  Can be tiled.

              If you specify -color, give three or more colors.  The first is the background color.

       -camo  Camouflage pattern.

              If  you  specify -color, give three or more colors.  The first is the background color; the others
              are colors for the leafy foreground shapes.  The foreground shapes will probably occupy nearly the
              entire image, so that the background color is barely visible.

       -anticamo
              Anti-camouflage pattern - like -camo, but ultra-bright colors.

              If you specify -color, this is the same as -camo.

       -argyle1
              A diamond argyle pattern, without a cross through the diamond, with one diamond.  Can be tiled.

              If you specify -color, give two colors: background and foreground, in that order.

              This option was new in Netpbm 10.78 (March 2017).

       -argyle2
              A diamond argyle pattern, with a cross through the diamond, with one diamond.  Can be tiled.

              If you specify -color, give three colors: background, foreground, and stripe, in that order.

              This option was new in Netpbm 10.78 (March 2017).

   Other Options
       -color colorlist
              This specifies the colors to appear in the pattern.

              If you do not specify this option, ppmpat chooses colors at random.

              Different patterns take different numbers of colors.  Some can involve variable numbers of colors.
              If you specify a number of colors incompatible with the pattern you specify, ppmpat fails, telling
              you how many colors to specify.

              colorlist is a comma-separated list of colors.

              Specify  each  color  as  described  for  the  argument  of  the  pnm_parsecolor() library routine
              ⟨libnetpbm_image.html#colorname⟩ .

              Example: -color red, green, rgbi:1.0/0.5/.25 .

              This option was new in Netpbm 10.78 (March 2017).

       -mesh  This option affects the patterns generated by the  -gingham2,  -gingham3,  -madras,  and  -tartan.
              When  this option is not specified, when two colors intersect, the program mixes them and puts the
              average in the rectangular intersection region.  with -mesh, the program fills that region with  a
              checkerboard  pattern  consisting  of the two colors.  The resulting image looks like a true woven
              fabric, with separate threads for the separate colors.

              This option was new in Netpbm 10.97 (December 2021).

       -randomseed integer
              This is the seed for the random number generator that generates the pixels.

              Use this to ensure you get the same image on separate invocations.

              By default, ppmpat uses a seed derived from the time of day and process ID, which gives you fairly
              uncorrelated results in multiple invocations.

              This option was new in Netpbm 10.61 (December 2012).

REFERENCES

       Some of the patterns are from "Designer's Guide to Color 3" by Jeanne Allen.

SEE ALSO

       pnmtile(1), pnmquant(1), ppmmake(1), ppmrainbow(1), pamgradient(1), ppm(1)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

DOCUMENT SOURCE

       This  manual  page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation
       is at

              http://netpbm.sourceforge.net/doc/ppmpat.html