[argyllcms] Re: DeviceLink Profile refining

On 2/14/07, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:

Looking at the PremiumGlossyPhoto results you posted, these
don't look unreasonable to me. Average and peak errors have halved,
so overall that's a pretty good result. I can understand that it's
not so good that the white has got worse, but I guess this is
the influence of trying to correct colors near white. You might
try adding several white test patches as a way of increasing
the weighting of the white error (the latest version of refine
will give the lightest patch an increased weight of 5 automatically.)

Another thing you could try is to leave out test patches of colors
that get worse, or edit the test results for those patches, making
them the same as the target, thereby selectively "turning off"
further corrections for those points. Clumsy, but it might help.


I will try this as soon as I will get the chance. It seems like a good
idea, because this is what I need: to stop samples going further away
from reference.
Adding more white patches sounds better, but testing will tell.
Thank you.


Having said all that, I've have had a bit of a play with refine, and think I've
struck upon a slightly better scheme to deal with out of gamut points, that
allows efforts to correct them without the correction "running away"
and causing things to get worse. I still notice some regressions for
dark out of gamut points though. The overall improvement is slight in
my tests, but may be worthwhile in improving behaviour for the critical
near white colors. If you're running MSWindows, you can try out this
version of refine here <http://www.argyllcms.com/refine.zip>.


Is this in the development tree? Because I am not using the
executables directly, but a small program which contains icclink +
refine + interface( measurement statistics and target displayed
visually ).
If it is not, then I will have to wait until you put it there.

Thank you again,
Marcel.

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