SUMMARY Kdenlive ignores the alpha channel of openexr images and image sequences. STEPS TO REPRODUCE 1. load an openexr image (or image sequence) with alpha channel 2. put it in a track directly over another track with a color clip OBSERVED RESULT color clip is hidden completely by the openexr, ignoring the alpha channel (alphaover/composite does nothing) EXPECTED RESULT color clip shining through alpha areas like with png
If kdenlive uses the EXR kimageformats plugin, it should be fixed with this MR: https://invent.kde.org/frameworks/kimageformats/-/merge_requests/172
Thanks Mirco. Yes, Kdenlive/MLT uses the kimageformats plugins to render EXR images, so this will effectively fix this problem. Hope it will be merged in a next Frameworks release.
(In reply to Jean-Baptiste Mardelle from comment #2) > Thanks Mirco. Yes, Kdenlive/MLT uses the kimageformats plugins to render EXR > images, so this will effectively fix this problem. Hope it will be merged in > a next Frameworks release. Merged today on KF5.
Hello Mirco. Is the issue fixed with the latest Kdenlive version?
(In reply to emohr from comment #4) > Hello Mirco. Is the issue fixed with the latest Kdenlive version? It is fixed in frameworks-kimageformats (KF5) and frameworks-kimageformats (KF6). Jean told to us that Kdenlive uses the frameworks-kimageformats plugin so it should fixed also in Kdenlive. I don't do video editing and point 2 of the instructions (to replicate the problem) is quite vague to me. Try it and let us know :)
Mmh. Kdenlive 24.08.1 can't import EXR files. I tried with the picture from here: https://raw.githubusercontent.com/AcademySoftwareFoundation/openexr-images/main/ScanLines/CandleGlass.exr
Created attachment 176004 [details] Testcase converted to PNG Image read by EXR plugin and converted to PNG (sRGB). I confirm that now the problem is not with the plugin in KImageFormats.
The alpha channel in "CandleGlass.exr" is correctly shown in Kdenlive master now. I closed this bug. If it still appears in the latest version, please feel free to re-open it and update the affected version number.