Re: Color Conversions and Dither
Re: Color Conversions and Dither
- Subject: Re: Color Conversions and Dither
- From: Robert Krawitz <email@hidden>
- Date: Fri, 16 May 2008 19:39:55 -0400
Date: Fri, 16 May 2008 10:52:52 -0700
From: "Roy Harrington" <email@hidden>
The Dither option in Color Settings applies to all conversions that
result in an 8bit file. This would include 8-bit to 8-bit color
profile conversions and all conversions of 16bit to 8bit --
i.e. explicit Mode conversions and Printing to an 8 bit driver.
The effect of the dithering is to preserve more of the 16bit data
in the 8 bit file. While this may seem like an impossible task it
in fact does this very well because adjacent pixels are averaged.
For example consider all the 16-bit values between 127 and 128,
without dither you'll get all the same 8bit values. But with dither
you can represent a patch of 127.3 with 30% 127 and 70% 128, and so
forth.
So if you spend the effort to use a 16bit workflow in general it's
well worth using the Dither on the way to the printer. There is no
negative side effect of multiple dithers -- it's a negative if you
don't use it. I'd consider it a mandatory option for just about
all PS work.
Of course, one *could* always use a 16-bit driver, like Gutenprint :-)
--
Robert Krawitz <email@hidden>
Tall Clubs International -- http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail email@hidden
Project lead for Gutenprint -- http://gimp-print.sourceforge.net
"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
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