https://bugs.kde.org/show_bug.cgi?id=415320
Bug ID: 415320
Summary: Conversion from openraster to png gives different
results unpredictably
Product: krita
Version: unspecified
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: File formats
Assignee: krita-bugs-n...@kde.org
Reporter: inklab...@gmail.com
Target Milestone: ---
Created attachment 124571
--> https://bugs.kde.org/attachment.cgi?id=124571&action=edit
Example ORA file that seems to cause the issue.
SUMMARY
When saving a certain .ora file as a png using Krita batch mode, the output
file will be slightly different seemingly randomly between two versions. Out of
a sample of 100 batch mode runs, I got 56 of one png file and 44 of the other,
not quite an even split but almost. In this case the ora file is two layers in
"dest-in" composite mode.
STEPS TO REPRODUCE
1. Place the ora file attached to a path, or make a new similar one
2. run $ krita <path> --export --export-filename <somepath>.png
3. run $ sha1sum <somepath>.png
4. Do steps 2-3 a number of times, and take note of the hash values
OBSERVED RESULT
The hash values are different seemingly at random.
EXPECTED RESULT
The hash values (and therefore the output image) should always be the same for
the same input.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KUbuntu 19.04
(available in About System)
KDE Plasma Version: 5.15.4
Krita 4.1.7.101 from Kubuntu apt
ADDITIONAL INFORMATION
I could only attach one file, so here are the example of png 1 and png 2
possibilities that were exported. When loading them in Krita and comparing, it
seems that one is slightly 'eroded' compared to the other.
https://pasteboard.co/ILQ01nD.png
https://pasteboard.co/ILPZKpO.png
Here is python code I used to get stats and also save text files of the
difference in pixel values between the images. It looks like there are
differences in the RGB channels but not the A channel:
https://www.pastiebin.com/5dfa4668c4098
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