ppmpat - make a pretty PPM image

       Copyright (C) 1989 by Jef Poskanzer.

       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.

       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

netpbm documentation                            12 November 2023                           PpmpatUserManual(1)

       ppmpat - make a pretty PPM image

       In  addition  to  the options common to all programs based on libnetpbm (most notably -quiet, see  Common
       Options ), ppmpat recognizes the following command line options:

   PatternSpecification
       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).

   OtherOptions-colorcolorlist
              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 .

              Example: -colorred,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).

       -randomseedinteger
              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).

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

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

ppmpat  [{-gingham2|-g2}  |  {-gingham3|-g3}  | -madras | -tartan | -poles | -squig | -camo | -anticamo |
       -argyle1 | -argyle2] [-colorcolorlist] [-mesh] [-randomseedinteger]

       widthheight

       You can abbreviate any option to its shortest unique prefix.