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| Summary: |
PNG images with transparent background still become black when resized |
| Issue Type: |
 Bug |
| Affects Versions: |
16.10.9, 17.4.2, 17.7.0 |
| Assignee: |
Unassigned |
| Attachments: |
PNG_Transparent_becomes_Black.png, ibm-spectrum-scale-1.png |
| Components: |
Image |
| Created: |
08/Sep/25 18:20 |
| Environment: |
Windows 11 Pro, Firefox 142, using an instance of XWiki 17.4.4 on PostgreSQL 17, Tomcat 11.0.10, reproducible also on Jetty/HSQL |
| Priority: |
 Blocker |
| Reporter: |
Ilie Andriuta |
| Description: |
Steps to reproduce
- Edit a page with CKEditor
- Insert a PNG image with a transparent background
- Click on the resize handle from the bottom right of the image and drag to resize it
- Save the page
Expected results The image is properly displayed. Actual results The image becomes black, or becomes color inverted in black/white. Please find attached the screenshot and the test PNG file. |
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