Re: Grayscale perception
Re: Grayscale perception
- Subject: Re: Grayscale perception
- From: Robert L Krawitz <email@hidden>
- Date: Tue, 6 Dec 2005 07:59:38 -0500
Date: Tue, 06 Dec 2005 13:58:52 +0100
From: Ernst Dinkla <email@hidden>
Graeme Gill wrote:
> Ernst Dinkla wrote:
>
>> As I understand it Gutenberg (used to be Gimp-print) is now 16 bit all
>> the way. QTR is based on Gimp-print there's a chance that this could
>> be the next step for QTR too.
>
> It also comes down to whether the screening actually supports 16 bits
> resolution.
>
> Graeme Gill.
That may be an issue for Gutenprint with color printers. Less
with quad printers. Anyway the Gutenprint information says
less banding issues (color) with 16 bit mode.
Gutenprint (and Gimp-Print, for that matte) does all of its screening
and color corrections in 16-bit resolution, although only Gutenprint
(aka Gimp-Print 5.x) offers 16-bit inputs in general cases. The issue
of whether you'll see more banding with 8-bit vs. 16-bit *inputs*
depends upon your source. If you do external correction/profile
application in 8-bit space and feed 8-bit data to Gutenprint (or any
other driver), you're likely to see banding (and/or its counterpart,
loss of tonal detail) in highlight gradients. If you do that
correction in 16 bit space you should be able to avoid that problem.
I don't know what Roy Harrington's plans are for Quad-Tone RIP.
--
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 Gimp Print -- http://gimp-print.sourceforge.net
"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
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