Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

ppmpat(1) [minix man page]

ppmpat(1)                                                     General Commands Manual                                                    ppmpat(1)

ppmpat - make a pretty pixmap SYNOPSIS
ppmpat -gingham2|-g2|-gingham3| -g3|-madras|-tartan| -poles|-squig|-camo| -anticamo width height DESCRIPTION
Produces a portable pixmap of the specified width and height, with a pattern in it. This program is mainly to demonstrate use of the ppmdraw routines, a simple but powerful drawing library. See the ppmdraw.h include file for more info on using these routines. Still, some of the patterns can be rather pretty. If you have a color workstation, something like ppmpat -squig 300 300 | ppmquant 128 should generate a nice background. OPTIONS
The different flags specify various different pattern types: -gingham2 A gingham check pattern. Can be tiled. -gingham3 A slightly more complicated gingham. Can be tiled. -madras A madras plaid. Can be tiled. -tartan A tartan plaid. Can be tiled. -poles Color gradients centered on randomly-placed poles. May need to be run through ppmquant. -squig Squiggley tubular pattern. Can be tiled. May need to be run through ppmquant. -camo Camouflage pattern. May need to be run through ppmquant. -anticamo Anti-camouflage pattern - like -camo, but ultra-bright colors. May need to be run through ppmquant. All flags can be abbreviated to their shortest unique prefix. REFERENCES
Some of the patterns are from "Designer's Guide to Color 3" by Jeanne Allen. SEE ALSO
pnmtile(1), ppmquant(1), ppm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 04 September 1989 ppmpat(1)

Check Out this Related Man Page

ppmquant(1)						      General Commands Manual						       ppmquant(1)

ppmquant - quantize the colors in a portable pixmap down to a specified number SYNOPSIS
ppmquant [-floyd|-fs] ncolors [ppmfile] ppmquant [-floyd|-fs] [-nofloyd|-nofs] -mapfile mapfile [ppmfile] All options can be abbreviated to their shortest unique prefix. You may use two hyphens instead of one to designate an option. You may use either white space or equals signs between an option name and its value. DESCRIPTION
pnmquant is a newer, more general program that is backward compatible with ppmquant. ppmquant may be faster, though. Reads a PPM image as input. Chooses ncolors colors to best represent the image, maps the existing colors to the new ones, and writes a PPM image as output. The quantization method is Heckbert's "median cut". Alternately, you can skip the color-choosing step by specifying your own set of colors with the -mapfile option. The mapfile is just a ppm file; it can be any shape, all that matters is the colors in it. For instance, to quantize down to the 8-color IBM TTL color set, you might use: P3 8 1 255 0 0 0 255 0 0 0 255 0 0 0 255 255 255 0 255 0 255 0 255 255 255 255 255 If you want to quantize one image to use the colors in another one, just use the second one as the mapfile. You don't have to reduce it down to only one pixel of each color, just use it as is. If you use a mapfile, the output image has the same maxval as the mapfile. Otherwise, the output maxval is the same as the input maxval, or less in some cases where the quantization process reduces the necessary resolution. The -floyd/-fs option enables a Floyd-Steinberg error diffusion step. Floyd-Steinberg gives vastly better results on images where the unmodified quantization has banding or other artifacts, especially when going to a small number of colors such as the above IBM set. How- ever, it does take substantially more CPU time, so the default is off. -nofloyd/-nofs means not to use the Floyd-Steinberg error diffusion. This is the default. REFERENCES
"Color Image Quantization for Frame Buffer Display" by Paul Heckbert, SIGGRAPH '82 Proceedings, page 297. SEE ALSO
pnmquant(1), ppmquantall(1), pnmdepth(1), ppmdither(1), ppm(5) AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer. 12 January 1991 ppmquant(1)
Man Page