Re: Grayscale perception
Re: Grayscale perception
- Subject: Re: Grayscale perception
- From: Ernst Dinkla <email@hidden>
- Date: Tue, 06 Dec 2005 14:47:53 +0100
Robert L Krawitz wrote:
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 understand that but the text in the announcement of
Gutenprint puts it slightly different:
The higher precision may improve results with certain source
material, particularly if it contains smooth color
gradients.
The result would be freedom from banding, particularly in
highlights where it might be visible with 8-bit color
computation. It may be somewhat slower than 8-bit printing.
Is the 16 bit mode smoother than the 8 bit mode when both get
ideal 16 bit color gradients input ?
Ernst
--
Ernst Dinkla
www.pigment-print.com
( unvollendet )
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