63 lines
2.6 KiB
PostScript
63 lines
2.6 KiB
PostScript
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% Copyright (C) 1999, 2000 artofcode LLC. All rights reserved.
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%
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% This software is provided AS-IS with no warranty, either express or
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% implied.
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%
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% This software is distributed under license and may not be copied,
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% modified or distributed except as expressly authorized under the terms
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% of the license contained in the file LICENSE in this distribution.
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%
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% For more information about licensing, please refer to
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% http://www.ghostscript.com/licensing/. For information on
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% commercial licensing, go to http://www.artifex.com/licensing/ or
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% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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% $Id: stocht.ps,v 1.6 2002/02/21 21:49:28 giles Exp $
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% helper file to simplify use of Stochastic Halftone - uses ht_ccsto.ps
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% This file sets the /StochasticDefault /Halftone as the current
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% and the /Default halftoning, loading the Stochastic halftone
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% if required.
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% Stochastic halftoning is recommended for inkjet printers, and may
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% produce output as pleasing as the more computationally expensive
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% "error diffusion" that *some* device drivers provide.
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% For printing technologies other than inkjet, Stochastic halftoning
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% may not look better than standard screening. In particular, thermal
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% transfer and direct thermal tend to be better with standard ordered
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% screening methods. Some laser printers may produce "smoother"
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% looking gray shades with Stochastic halftoning. Try it, and if
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% you like it, use it.
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% Note that this /Default halftone can be overridden by PostScript
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% operators that set the screening or halftone (such as setscreen).
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% To make Stochastic Halftone be "sticky" so that other screening and
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% halftone setting in the subsequent PostScript will be ignored, use:
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% -c "<< /HalftoneMode 1 >> setuserparams"
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% on the command line prior to the file to be processed. For example,
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%
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% gs stocht.ps -c "<< /HalftoneMode 1 >> setuserparams" -f examples/tiger.eps
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% Alternatively, the command to set the /HalftoneMode userparam can be
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% concatenated to this file (see below).
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% =====================================================================
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% Try to get the previously defined resource
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{ /StochasticDefault /Halftone findresource } stopped
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{
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pop pop
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% Need to load the Stochastic Halftone using the lib file
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(ht_ccsto.ps) runlibfile
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} if
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% If we didn't error out by now, then go ahead and define the /Default
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/StochasticDefault /Halftone findresource
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/Default exch /Halftone defineresource
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sethalftone % Use the halftone
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% Uncomment the next line to make the Stocahstic halftoning be "sticky"
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% << /HalftoneMode 1 >> setuserparams
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