[Openicc] Google Summer of Code 2011 Students

Kai-Uwe Behrmann ku.b at gmx.de
Thu Apr 28 12:08:14 PDT 2011

Am 28.04.11, 19:26 +0100 schrieb Richard Hughes:
> On 28 April 2011 18:54, Kai-Uwe Behrmann <ku.b at gmx.de> wrote:
>> "ICC Device Profile Repository" at the openSUSE organisation
>> A colour database to allow clients to request or submit colour profiles for
>> colour managed devices. The idea was proposed at openSUSE as a collaboration
>> project in their ongoing support of colour management. It will be mentored
>> with the help from OpenICC people.
> Is the idea that users upload profiles they've generated for hardware?

Yes, it is and was already discussed some time ago here on list.

> If so, I'm not sure how well that would work, as laptops frequently
> ship with the same EDID specified model and manufacturer but get made
> in different factories and using different processes. As a datapoint,

I could find four laptops with the same panel manufaturer in the EDID 
entries in very different brands. They where colorimetrically not too far 
away from each other. However libXcm found enough differences to identify 
the devices through reading EDID informations.

> there are two factories on different continents producing panels for
> the IBM T61 with 2 different coating options on each. And there's the

Do you have he EDID block of both?

> case that as a LCD gets older it gets less bright, and more yellow.

Heartedly agreed. The repository is not designed as replacement for custom 
calibrations where colour counts very much, like in proofing. Its designed 
for average users, amateurs and artists without any expensive measurement 

> And, for CRT's all bets are off as you can manually change the
> "contrast" and color temperature. This means any color profile for one
> used on the other is at best an approximation, and at worse completely
> wrong.

I found only one device for which a online ICC device profile would bring 
a serious improvement compared to a on the fly generated EDID profile.
But we should think about a veto option for users to avoid certain 
profiles they do no like from repeatedly downloading. That would be a kind 
of black list for automatic selectable profiles.

> I think such a project would work very well for scanners (which seem
> remarkably stable), but I'm not sure display or printer devices would
> be served very well.

Kai-Uwe Behrmann
developing for colour management 
www.behrmann.name + www.oyranos.org

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