https://bugs.kde.org/show_bug.cgi?id=460380
Bug ID: 460380
Summary: AVIF Images with Alpha Channel Don't Export With
Expected Translucency When Using PQ
Classification: Applications
Product: krita
Version: 5.1.1
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: File formats
Assignee: krita-bugs-n...@kde.org
Reporter: robbtb...@gmail.com
Target Milestone: ---
Created attachment 152778
--> https://bugs.kde.org/attachment.cgi?id=152778&action=edit
Exported AVIF showing the issue. Ignore the file name change. It was for
browser dev tools convenience.
SUMMARY
STEPS TO REPRODUCE
1. File>Open a PNG with Transparency
(https://testufo.com/images/blurbustersUFOborder-2x.png)
(Resize image via Scale Image to New Size... menu item)
2. Using the Krita HDR documentation at
https://docs.krita.org/en/reference_manual/hdr_display.html, replace SDR pixels
with HDR pixels with the color selector set to 1000 nits.
3. Everything in Krita suggests that there's a correct alpha channel and the
image content is opaque.
4. Export as AVIF via the Export Advanced menu, choosing Lossless, Chroma 444,
Rec 2100 PQ.
OBSERVED RESULT
Exported image as seen in Chrome (Stable and Canary) has translucency in image
content
EXPECTED RESULT
Exported image as seen in Chrome (Stable and Canary) DOES NOT have translucency
in image content
SOFTWARE/OS VERSIONS
Windows: 11
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
A test of File>Open of the same png and immediately exporting as AVIF does not
have erroneous/unexpected translucency.
I'm doing this HDR image work in the context of HDR capabilities being added to
Chrome. Those capabilities are in Chrome Canary and this test page (where I
substituted the exported AVIF above) is what surfaced the issue:
https://ccameron-chromium.github.io/webgl-examples/canvas-hdr.html
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