The thumbnail resolution in gwenview is very low.
How to set a higher resolution?
Gwenview 25.12.3-1.1
Plasma 6.6.2
What do you mean ?
Is that the size of the thumbnails you are referring to ?
There is a zoom slider at the bottom right of the window to change this.
The pixel density of the thumbnails is the maximum allowed given the size of the thumbnail, the size of the image and your screen scale factor.
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If a thumbnail isn’t clear, that’s likely because it’s a reduced size and unable to present the same resolution… an image with text, for example… but you can scroll in until the thumbnail fills the window - and the resolution increases the more you zoom in… to get higher resolution you must open the image, and max resolution is when the image is displayed 1:1.
If you have an issue with the thumbnail just getting blurry when you zoom in, it can mean the original image is low resolution, as I experienced when downloading from a website, and including website thumbnails alongside the fullsize images… try to zoom in a thumbnail and it just gets blurry.