Set Image Preview in Dolphin to filter nearest?

Help
,
1

Can I set image previews in Dolphin to filter to nearest, especially for smaller files?

I want to be able to have pixel art previews, which I want to be pixel perfect (filtered by nearest).

2

Seems Dolphin lets you add thumbnailers for new formats, but unfortunately, not override its built-in ones.

But it caches thumbnails in ~/.cache/thumbnails, so if you generate thumbnails with a script ahead of the time, in the format Dolphin expects, it will happily use that.

Example command line:

magick /home/jin/tmp/test.png -filter point -resize 320 -raise 20 -set "Thumb::URI" "file:///home/jin/tmp/test.png" -set "Thumb::MTime" (stat -c %Y /home/jin/tmp/test.png) PNG32:x-large/(echo -n file:///home/jin/tmp/test.png | md5sum | cut -d ' ' -f 1).png
3

While unfortunate, completely overriding the thumbnailer shouldn’t even be necessary, as long as Dolphin provides some settings to set for them.

4

Dolphin doesn’t have (anymore) settings for thumbnails generation.

But dolphin supports two kinds of thumbnailers, plugins (kio-extras…) and thumbnailers (Thumbnail Managing Standard blog post: Gnome Thumbnailers) that are just scripts with some metadata located in special folders (/usr/share/thumbnailers).

You can disable the built-in thumbnailer plugin and replace it with your own.

Set Image Preview in Dolphin to filter nearest? - #2 by jinliu would work too.

5

What is smaller files ?
Less than 256 px x 256 px ?

I wouldn’t mind adding this by default.

What would be affected, the small icon, the big icons, the information panel ?

Spectacle has such a behavior when zoom is active.

6

Yeah, anything smaller than 256 or maybe only 128 pixels is what I consider “small”.

I’d say everywhere? I mainly only use big icons to preview images. Small icons would probably not have enough screen real-estate to actually see the individual pixels well enough.

Indeed, that’s how I view them quickly if I do need to view it as crisp pixel art, but opening and closing a separate app just to view something quickly gets tedious after a while.

7

We have a contradicting use-case: icons designing. Without necessarily using plasma-sdk cuttlefish.
It is great that one can have previews from dolphin.