https://bugs.kde.org/show_bug.cgi?id=505609
Bug ID: 505609
Summary: 8bit JXL images with alpha have no transparency
Classification: Applications
Product: digikam
Version First 8.7.0
Reported In:
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: DImg-Plugins
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
QImage plugin ignores transparency of 8 bit images with alpha channel.
STEPS TO REPRODUCE
1. Add JXL 8 bit image with transparency to library
2. Open the image with digiKam/showFoto
SOFTWARE/OS VERSIONS
Linux: openSUSE Tumbleweed
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
ADDITIONAL INFORMATION
>From Qt 5.15 documentation: "QColor::QColor(QRgb color) Constructs a color with
the value color. The alpha component is ignored and set to solid."
Suggested patch:
```patch
diff --git a/core/dplugins/dimg/qimage/dimgqimageloader_load.cpp
b/core/dplugins/dimg/qimage/dimgqimageloader_load.cpp
index 705597d8d..83491f38e 100644
--- a/core/dplugins/dimg/qimage/dimgqimageloader_load.cpp
+++ b/core/dplugins/dimg/qimage/dimgqimageloader_load.cpp
@@ -146,7 +146,7 @@ bool DImgQImageLoader::load(const QString& filePath,
DImgLoaderObserver* const o
for (uint i = 0 ; i < w * h ; ++i)
{
- QColor color(*sptr);
+ QColor color = QColor::fromRgba(*sptr);
dptr[0] = color.blue();
dptr[1] = color.green();
dptr[2] = color.red();
```
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