Preview out of focus

Software darktable
1

Hi everyone,

I’m using the flatpak Darktable version 3.8.0 on Ubuntu 20.04.3.

When previewing photos with ALT + w , they appear slightly out of focus/soft with the initial zoom level (fit). I need to zoom in one step to be able to see the correct focus/sharpness. I don’t remember this being an issue previously.

I had been playing around with the prefer performance over quality setting earlier today but have since disabled it.

Anyone seeing this issue?

Here’s a couple screenshot to demonstrate the issue.

This is the initial zoom level (fit):

fit_zoom
fit_zoom1523×1012 893 KB

And this is with one level of zoom (33%):

33_zoom
33_zoom1903×1010 1.71 MB

2

what is setting for the resolution of your thumbnails?

3

I finally fixed it. It seems like Darktable kept a cache of the low resolution version of the photo from when I was using the Prefer performance over quality setting.

After clearing the cache (renaming ~/.var/app/org.darktable.Darktable/cache/darktable/mipmpas-123456.d to old.mipmpas-123456.d), when displaying the preview with ALT + w darktable started loading the picture and the full resolution image was displayed.

I’m not sure if it’s a bug but this was a really strange behavior, I would have expected Darktable to automatically invalidate the cache if the option is toggled on or off.

4

To the best of my knowledge, no. You need to run darktable-generate-cache or empty the cache as you did.