https://bugs.kde.org/show_bug.cgi?id=523689
Bug ID: 523689
Summary: Krita 6 cannot load brush presets (kpp) with large
iTXt chunks - Qt6 libpng out of memory
Classification: Applications
Product: krita
Version First 6.0.3
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Resource Management
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 194732
--> https://bugs.kde.org/attachment.cgi?id=194732&action=edit
logs
Title: Krita 6 (Qt6) cannot load brush presets (kpp) larger than ~7MB - iTXt
out of memory
Description:
Krita 6.0.3 (Qt6) fails to load brush presets (kpp files) that are
larger than ~7MB. This is not just a third-party compatibility issue —
presets created natively inside Krita 6 itself also disappear after
restart with the same error.
Steps to reproduce:
1. Create a new brush preset using an RGBA animated brush tip
2. Save it (resulting kpp file ~10MB)
3. Restart Krita 6
4. Preset is gone
OR:
1. Import memileo Impasto Brushes 1.0 bundle (created with Krita 5.2.2)
via Settings → Manage Resource Libraries
2. Only tags appear, no brush presets are loaded
Workarounds attempted (all failed):
- Import bundle via Settings → Manage Resource Libraries
- Copy kpp files directly to ~/.local/share/krita/paintoppresets/
- Create new brush preset natively in Krita 6 (~10MB kpp)
→ also disappears after restart
Console output:
qt.gui.imageio: libpng warning: iTXt: out of memory
Could not load the resource from the bundle "paintoppresets"
"paintoppresets/memileo 01 Brush - Flat Tip.kpp"
"/home/user/.local/share/krita/memileo-Impasto-Brushes-1.0.bundle"
The affected kpp files range from 7MB to 27MB. All load correctly
in Krita 5.3.3 (Qt5, installed via Flatpak).
Root cause appears to be Qt6's libpng failing to allocate memory
when reading large iTXt chunks, which is the format kpp files use
to store preset data.
System:
- Arch Linux (rolling), Krita 6.0.3
- Qt 6 (system), libpng (system)
- NVIDIA RTX 3080 Ti, driver 610.43.03
- Wayland (niri compositor)
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