[Desktop_printing] Smooth dithering

Kai-Uwe Behrmann ku.b at gmx.de
Fri Feb 17 13:02:16 PST 2006


thanks for the hint. I will switch to the gs mailing list to discuss there 
Ghostscript details. Hope that is ok.

What means SIMD?

Kai-Uwe Behrmann
                                + development for color management 
                                + imaging / panoramas
                                + email: ku.b at gmx.de
                                + http://www.behrmann.name

Am 17.02.06, 11:35 -0800 schrieb Ralph Giles:

> On Fri, Feb 17, 2006 at 07:21:06AM -0500, Robert L Krawitz wrote:
> > I believe that the latest version of EvenTone dithering that Raph
> > Levien has released can do this; I just haven't had time to study the
> > code and implement it.  This is very much something I want to do; if
> > anyone has the time to volunteer for this it would get it done a lot
> > faster.
> The output I've seen looks really, really good. But my understanding is 
> that careful development of a colourmap for each device (and paper) is 
> important not just for accurate colour rendering but for achieving 
> smooth and even dither tone.
> A version of Raph's work is in the recently released GPL Ghostscript 
> 8.50 (as well as the AFPL head of course) along with a profile for
> the Epson 2200:
>   http://svn.ghostscript.com:8080/ghostscript/tags/ghostscript-8.50-gpl/src/gdevrinkj.c
>   http://svn.ghostscript.com:8080/ghostscript/tags/ghostscript-8.50-gpl/src/rinkj/
>   http://svn.ghostscript.com:8080/ghostscript/tags/ghostscript-8.50-gpl/lib/rinkj-2200-setup
> If anyone wants to give it a try. There is a patent warning in the code; 
> but the technology may be used royalty free in free software.
> Also, IIRC, one really wants SIMD accelleration when driving large 
> format (or just fast) printers. The latest (unreleased) version of
> the engine contains some; Raph said he'd consider releasing it as well
> if there's interest.
>  -r

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