[Digikam-users] Working with CIELab TIFFs?

Gilles Caulier caulier.gilles at gmail.com
Fri May 16 13:03:32 BST 2014

2014-05-16 13:45 GMT+02:00  <torsten.crass at ebiology.de>:
> Hi,
>> There is already a report in bugzilla about this topic.
>> Look here for details :
>> https://bugs.kde.org/show_bug.cgi?id=186054
> I see... but this only addresses half the issue. As you say...
>> The only way to support non RBG color space with tiff is to process
>> LAB=>RGB conversion in your case. It's already done for some others
>> color spaces, but not yet with LAB...
> ...this is about DidiKam internally converting Lab input images to RGB prior
> to any processing (like thumbnail generation or edit actions). I wonder if
> it was possible to allow for DigiKam to handle Lab *internally* so that one
> would be able to e.g. adjust color without altering percieved brightness.

No. For the moment image container is based on ARGB unsigned short
data conatiner by color component to optimize memory allocation.

RGB color space will deserve 90% of user cases.

Changing color component storage in memory will require to change a
lots of code everywhere.

Nota : For image quality reason i know 3 code that use LAB color space
to work in digiKam : Noise reduction, Local Contrast, and Restoration

Gilles Caulier

> Regards --
>         Torsten
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