Thumbnails not color-managed + severely distorted shadow tonality for thumbs, previews

Elle Stone ellestone at
Wed Nov 15 21:38:37 GMT 2017

On 11/15/2017 03:48 PM, Maik Qualmann wrote:
> For the preview to have clean transitions, the option "Preview image is
> converted to 8 bits for a faster viewing" must be disabled.

That is already unchecked. Unchecking is the same as disabling, yes?

 > Can you provide a image to test the color management?

Yes. I probably won't be able to provide the image until tomorrow morning.

In the meantime, I downloaded the digiKam source code from

and modified core/libs/dimg/filters/icc/icctransform.cpp line 58 from

transformFlags = 0;


transformFlags = cmsFLAGS_NOOPTIMIZE;

I'm following the compile instructions here:

Should those instructions say to uninstall digiKam from whatever 
repository it might already be installed from, such as Gentoo Portage in 
my case? Anyway, I just uninstalled digiKam from Gentoo Portage and 
digiKam from git is building.

Hmm, sadly the build errored out at 95%, with this message:

[ 95%] Building CXX object 
[ 95%] Building CXX object 
[ 95%] Building CXX object 
[ 95%] Building CXX object 
[ 95%] Building CXX object 
[ 95%] Building CXX object 
[ 95%] Building CXX object 
[ 95%] Building CXX object 
[ 95%] Linking CXX executable showfoto
[ 95%] Built target showfoto
make: *** [Makefile:141: all] Error 2

I never use showfoto - can digiKam be build without showfoto? If yes, 
what do I modify to make this happen? If no, any idea why the build 
stopped at building showfoto? I'd like to build digiKam with the right 
lcms flags to disable all partial and full lcms "optimizations".


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