Bug 501351

GWENVIEW USES BLURRY SCALING METHOD/ALGORITHM


STEPS TO REPRODUCE
1. Open an image with a higher resolution than your display
2. Scale the image in any way with it still being higher dpi relative to your display
3. Observe blurry scaling of the image
4. (optional) Open same image with same scaling in Nomacs (or any other viewer with good scaling method)
5. (optional) Confirm that compared to Nomacs Gwenview does have a blurry scaling method

OBSERVED RESULT
Blurry images on scaling in any direction (zoom in/out)

EXPECTED RESULT
Naturally crisp images on zoom in any direction (as long as you don't zoom it into oblivion)

ADDITIONAL INFORMATION
See attached screenshots to compare the quality of scaling
*I did not manage to match the zoom levels perfectly in both image viewers 

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20250307
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.5-1-default (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 4800H with Radeon Graphics
Memory: 30.7 ГіБ of RAM
Graphics Processor 1: AMD Radeon Graphics
Graphics Processor 2: NVIDIA GeForce GTX 1650
Manufacturer: HP
Product Name: HP Pavilion Gaming Laptop 15-ec1xxx