https://bugs.kde.org/show_bug.cgi?id=468609

--- Comment #4 from Dan <dkb...@tofubar.com> ---
One of the images I've used for testing is: 
https://drive.google.com/file/d/1R8nlefUAu5fgwKc57Sd0AzU4R_nE-ZoA/view?usp=drive_link

With the patch it does 10 bit to 16bit scaling shift fine rather than the
direct to 8 bit conversion before. The colours are a bit washed out as with 8
bit. My reading regarding the colour profile: ITU-R BT.2100 PQ is that this is
a non linear conversion. I think canon are using nclx so dropping through to
the "Unknown HEIF color profile type discarded" warning. There is more
reading/hacking before I get my head around that part.

Dan

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