Restarting digiKam makes the thumbnails color-managed.Īlso the thumbnails are 8-bit images, which explains the severe shadow posterization for the thumbnails. I can reproduce the “not-color-managed” thumbnails for digiKam compiled from git “at will” by uninstalling or installing the system monitor profile while digiKam is running, combined with changing the digiKam monitor profile when there is no installed monitor profile (if there is an installed monitor profile, digiKam doesn’t allow changing the monitor profile). I did some additional experimenting and realized that whatever was making the digiKam 5.7.0 thumbnails not be color-managed is strictly something on my own system, buried somewhere in a configuration file. These screenshots illustrate the problem with digiKam - click on the image to see the larger version: So if digiKam devs decide to offer this option (I hope they do - I’m about to send an email to the mailing list), it would require also writing a suitable user interface such as Krita and GIMP both already have. But for an application like digiKam the user should be given a choice because apparently not using the optimizations can sometimes slow down the conversion and display of images. This sounds like a simple change in the digiKam code, and it works for me because the option to allow the LCMS optiimizations is an option I don’t ever use. This modification allows digiKam image previews to match GIMP and Krita displays of linear gamma images, assuming in Krita the user has unchecked the option to allow LCMS optimizations. Yesterday evening I solved the “find an image viewer that can show linear gamma images” by downloading and compiled digiKam from git, after first modifying a line in core/libs/dimg/filters/icc/icctransform.cpp to change the variable"transformFlags" from “0” to to “cmsFLAGS_NOOPTIMIZE”. I think it requires installing WINE? and it’s not free/libre? XNView is great software - I used it back when I used Windows, and it’s wonderful that the dev also makes it available for Linux.
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