gimpprint-dithers man page on SunOS

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GIMPPRINT-DITHERS(7)	    Gimp-Print Manual Pages	  GIMPPRINT-DITHERS(7)

NAME
       gimpprint-dithers - Gimp-Print dither algorithms

DESCRIPTION
       Gimp-Print  includes  several dither algorithms.	 Dithering attempts to
       reproduce various shades of gray (or all colors) from only a  few  dif‐
       ferent inks (black, cyan, magenta, yellow, and sometimes light cyan and
       light magenta).	The dots can't vary in darkness or  size  (except  for
       certain	special	 printers), and so we need to lay down a certain frac‐
       tion of dots to represent each distinct level.  Different dither	 algo‐
       rithms  are  suited  to	different purposes, and some are significantly
       faster than others.

DITHER ALGORITHMS
       Dither Algorithm	  Description
       ───────────────────────────────────────────────────────
       Adaptive		  Adaptive Hybrid
       EvenTone		  EvenTone screening (experimental)
       Ordered		  Ordered
       Fast		  Fast
       VeryFast		  Very Fast
       Floyd		  Hybrid Floyd-Steinberg

       For the highest quality, we recommend use of Adaptive Hybrid dithering.
       For  continuous tone images, Ordered works just as well and is somewhat
       faster.	Ordered dithering yields noticeably inferior results with text
       and intricate line art, particularly at high resolutions.

       EvenTone	 dithering  is a relatively new screening technology developed
       by Raph Levien.	It offers superior smoothness in highlights  and  mid‐
       tones,  and  increased  accuracy in shadows, resulting in significantly
       improved results overall.  The version of EvenTone  dithering  that  we
       are  using  is enhanced with some additional improvements we have made.
       It currently only operates with CMYK (4, 6, or 7 color output) with RGB
       input, and should be considered experimental.  Note that it is patented
       (see US patent 5917614), but it is licensed for use with GPL  software.
       See http://www.levien.com/patents.html for more information.

       Fast  dithering,	 which	is  a simplified version of ordered dither, is
       significantly faster, but color accuracy is worse, particularly on  six
       color  printers	and  printer using variable dot sizes.	On simple four
       color printers, the quality is quite reasonable, although color	print‐
       ing  will  show	more speckling in dark tones than Ordered dither.  For
       single dot size printers, printing  grayscale,  this  algorithm	yields
       almost  identical results to Ordered with some performance improvement.
       On three color printers, the results should be very similar to Ordered.

       Very Fast is even faster than Fast, with even more loss of quality.  It
       shows  even  more  speckling,  and the output is heavily patterned.  On
       laser printers, and possibly on certain kinds of	 text  and  line  art,
       Very Fast dithering may actually yield the best quality.

       Error  diffusion	 algorithms  (Hybrid  Floyd-Steinberg is such an algo‐
       rithm) perform very well at high densities, and are capable of  render‐
       ing  very  fine	detail well, but they tend to exhibit artifacts in the
       form of "waves" or "worms" of dots which results in noticeable  textur‐
       ing  in	pale  areas.   Furthermore, pale areas immediately adjacent to
       white take a while to "build up" sufficient  error  to  print  at  all.
       This is sometimes called "tearing".  Its use is not recommended.

COPYRIGHT
       Copyright  ©  2001  Michael  Sweet (mike@easysw.com) and Robert Krawitz
       (rlk@alum.mit.edu)

       This program is free software; you can redistribute it and/or modify it
       under  the  terms of the GNU General Public License as published by the
       Free Software Foundation; either version 2 of the License, or (at  your
       option) any later version.

       This   manual   page   was   written  by	 Roger	Leigh  (roger@whinlat‐
       ter.uklinux.net)

SEE ALSO
       gimpprint-color(7),   gimpprint-imagetypes(7),	gimpprint-inktypes(7),
       gimpprint-mediasizes(7),	  gimpprint-mediasources(7),   gimpprint-medi‐
       atypes(7), gimpprint-models(7), gimpprint-resolutions(7).

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌────────────────────┬─────────────────┐
       │  ATTRIBUTE TYPE    │ ATTRIBUTE VALUE │
       ├────────────────────┼─────────────────┤
       │Availability	    │ SUNWgimpprint   │
       ├────────────────────┼─────────────────┤
       │Interface Stability │ External	      │
       └────────────────────┴─────────────────┘
NOTES
       Source for gimp-print is available in the SUNWgimpprintS package.

Version 4.2.6			  11 Jan 2004		  GIMPPRINT-DITHERS(7)
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