[argyllcms] Re: icclink -G and source gamuts /-profiles
- From: "Alastair M. Robinson" <profiling@xxxxxxxxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 11 May 2008 00:41:18 +0100
Hi,
Klaus Karcher wrote:
some good news: with cctiff -p, at least the ordinary transformations
are ok -- but the deviceLink transformations are still different.
Ah, cool - I've tried that, with the "synthetic" profiles I created
earlier, and the discrepancies in transforming from a 1.0-gamma profile
to a real profile pretty much vanish if the -p option is passed to cctiff.
I also compared with the lcms tifficc output - lcms seems to be affected
by this issue too, but not as severely.
What's interesting is that with a pathologically high gamma (out of
curiosity I tested with 4.0 as well as 1.0) there are discrepancies, but
they're far more subtle than with the 1.0 gamma profile.
As for building the device link - do your results improve if you use the
-n flag to icclink? It reduces the error here, but certainly doesn't
eliminate it.
Oh, BTW, Graeme, the documentation for icclink's -n option seems to be
missing.
All the best,
--
Alastair M. Robinson
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