https://bugs.kde.org/show_bug.cgi?id=468609
Bug ID: 468609
Summary: Loads heif only with 8 bits color depth
Classification: Applications
Product: digikam
Version: 8.0.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: ImageEditor-Load
Assignee: digikam-bugs-n...@kde.org
Reporter: i...@j-pfennig.de
Target Milestone: ---
Currently tiff and jpeg2000 images with > 8 bit color depth load correctly, but
this does not work with heif. Heif images are implictly converted to 8 bit
depth (probably the same happens with jpeg xl). Also Exif data seems to be
ignored on load.
How to reproduce
1) I prepared some test images, see
https://drive.google.com/drive/folders/1ughS3RvBTwBNac0EF_i6jPtkicxw_U0a?usp=sharing
(170 MByte)
That folder also includes a tool to convert images using IM 7.x, a test script
and some documentation.
2) IM legacy (6.9) does not create >8 bit heif! You need IM 7.x (I used 7.1).
Debian/Ubuntu still distribute 6.9.
3) KDE/digikam use libtiff which supports only 8/16 depth. Oly IM would handle
other tuple sizes correctly. The 10-bit tiff test image therefore is physically
16-bit and masks-out the lower 6 bits.
4) Verify the color depth with IM identify (7.x) or gimp (2.10.34) or IM
-format %k
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