This is making me crazy. I don’t see the logic and behaviour for thumbnails creation/update in Darktable.
I used to do this: import bunch of photos, use
darktabIe-generate-cache to create previews so that I can quickly make an edit in lighttable and decide what to keep, what to throw away. Then go do darkroom and do my processing on a few images. The thumbnail that is displayed in lighttable would then get updated and that’s the end of it.
I’m not sure when/why, but this is not working anymore and DT always insists on re-creating the thumbnails.
These are the options that I have now:
- Don’t use embedded jpegs but half-size raw: [checked]
- high-quality thumb processing from size: WQXGA
- memory in mb to use for thumbnail cache: 4000
- enable disk backend for thumbnail cache: [checked]
- enable disk backend for full preview cache: [checked]
Please have a look at the attached screencast. It is only 1’30"; you will see me starting up darktable, then I select a photo in lighttable, hit my “sticky preview” shortcut on an image, wait until the image gets “rendered”, then move to another image, do the same, then return to the first image and the preview is not stored, so it has to be re-created! I repeat this process a few times. It should not do that, once a preview has been created why does it do it again and again? I’m pretty sure this wasnt’ the case a while ago but I may be wrong. I have played with the options above but now I don’t see the logic behind it all, because even if I unselect “Don’t use embedded jpegs” then I would expect to see a fast preview from the jpeg stored into the raw file, but in fact it’s the same as before!
As an additional note, I use that preview size (WQXGA) because my monitor is 2560x1440px. And I have 16Gb of ram.
thanks for any help!