https://bugs.kde.org/show_bug.cgi?id=407251
Bug ID: 407251
Summary: Converting animation color space from 16bit to 38bit
creates artifacts in onion skin
Product: krita
Version: nightly build (please specify the git hash!)
Platform: MS Windows
OS: MS Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Color models
Assignee: krita-bugs-n...@kde.org
Reporter: tamtamy.tym...@gmail.com
Target Milestone: ---
Created attachment 119858
--> https://bugs.kde.org/attachment.cgi?id=119858&action=edit
Animation test file before converting to 8bit
SUMMARY
If you convert animation from higher bit depth than 8bit, it will show
artifacts on onion skin.
STEPS TO REPRODUCE
1. Make an animation in, let's say, 16bit/float color space (can be the default
one).
2. Turn on onion skin.
3. Convert image color space to 8bit int color space (can be the default one).
4. Switch time to another keyframe.
OBSERVED RESULT
Onion skin is full of weird artifacts. Frames are both red and green in the
same time.
EXPECTED RESULT
Onion skin colors the keyframes in consistent manner.
NOTES
If you turn on and off onion skin, it doesn't start working correctly, the
artifacts are still visible.
If you undo convert color space, the artifacts are still visible until you
switch the keyframe.
If you reopen the image (save, then open the saved image), onion skin looks
correct.
Possible duplicate: bug 405753
Reason to not include the bug there: bugs mentioned in bug report 405753 are
all a result of a correct application of the composition mode used to paint
onion skin, while this bug report shows a problem in the composition mode code
itself. Change in the method of compositing onion skin would only hide the
problem.
Possible duplicate: bug 404133
Why: the artifacts looks very similar
Reason to create a new bug report: the bug report 404133 mentions problems on
32bit images that were not reproducible on 16bit float images. The problem
described in this bug report doesn't (need to) involve 32bit float color space
at all. Also the problem mentioned in this bug report was also present in
4.1.7, while bug 404133 is a regression between 4.1.7 and unreleased yet 4.2.0.
OS INFORMATION
Krita
Version: 4.2.0-pre-alpha (git fb08951)
Languages: pl, en_US
Hidpi: true
Qt
Version (compiled): 5.12.2
Version (loaded): 5.12.2
OS Information
Build ABI: x86_64-little_endian-llp64
Build CPU: x86_64
CPU: x86_64
Kernel Type: winnt
Kernel Version: 10.0.17134
Pretty Productname: Windows 10 (10.0)
Product Type: windows
Product Version: 10
Hardware Information
GPU Acceleration: auto
Memory: 16191 Mb
Number of Cores: 12
Swap Location: C:/Users/Agata/AppData/Local/Temp
OpenGL Info
Vendor: "Google Inc."
Renderer: "ANGLE (Intel(R) UHD Graphics 630 Direct3D11 vs_5_0 ps_5_0)"
Version: "OpenGL ES 3.0 (ANGLE 2.1.0.57ea533f79a7)"
Shading language: "OpenGL ES GLSL ES 3.00 (ANGLE 2.1.0.57ea533f79a7)"
Requested format: QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 10, greenBufferSize 10, blueBufferSize 10, alphaBufferSize 2,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::bt2020PQColorSpace, profile
QSurfaceFormat::CompatibilityProfile)
Current format: QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 10,
greenBufferSize 10, blueBufferSize 10, alphaBufferSize 2, stencilBufferSize 8,
samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0,
colorSpace QSurfaceFormat::bt2020PQColorSpace, profile
QSurfaceFormat::NoProfile)
Version: 3.0
Supports deprecated functions false
is OpenGL ES: true
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