Full preview low resolution

Software darktable
1

I’m not sure if this is related, but after I ran darktable-generate-cache, everytime I enter full preview mode (W in lighttable), I get a low resolution version of the image.
I’m not sure if darktable uses the cached thumbnails to show the preview, but I confirm that all thumbnail resolutions are present for the given image.
When I ran darktable in debug mode, I saw some commands referring to a number that I assume is the thumbnail resolution folder. In this case, it stated “3”:

[mipmap_cache] grab mip 3 for image 39229 from disk cache

Looking at the image thumbnail in folder 3 (~/.cache/darktable/mipmaps…/3), it seems to be the same low res image shown in the full preview.
I wonder why doesn’t it show the highest resolution thumbnail, since it’s there on folder “7”.

Attached, the debugging session log.
dt.txt (385.7 KB)
(In this session, all I did was hovering the cursor on the image, pressing SHIFT+W, and then quitting darktable)

I’m on darktable 3.2.1

2

3.3.0+258~g38d875b49, Ubuntu 18.04
I can definitely confirm. I also have made available the thumbnails in all 8 supported sizes using darktable-generate-cache. preferences → lightable → high quality thumb processing from size is set to “always”, but the preview is shown in a very insufficient resolution.

1 Like
3

See also: Lighttable previews rendered at low resolution on 4K screen · Issue #5947 · darktable-org/darktable · GitHub and Lighttable Previews Pixelated on HighDPI Screen - #4 by bastibe

1 Like
4

Thanks for pointing that.
I added a comment to that issue and attached the debugging log to it.