Les fichiers previews ne s'effacent pas

[Minaris]

Bonjour la communauté,
J'aimerai que le dossier des previews perde du poids. Je parle du dossier "cat_LR Previews.lrdata" qui se trouve dans le catalogue.
Comme je suis photographe pro et que je gère énormément de fichiers, ce dossier preview grossit vite.
J'ai pourtant spécifié l'option effacer après 7 jours mais il semble que cela n'ait pas d'effet. Et du coup en quelques mois il atteint pas loin de 50go.
Bref, est-ce qu'il y a un bug connut avec la fonction d'effacement automatique?
Merci

[Akash Sharma]

Hi Minaris,

The "cat_LT Previews.lrdata" folder contains the rendered previews of your images in Lightroom. If you'd like to manage your primary storage, I'd recommend that you store your catalog on an external drive. See Photoshop Lightroom catalog FAQ

You may discard the previews folder but it will be repopulated again as you go through your catalog.

Let us know if that helps.

Thanks,

Akash

[Minaris]

Hi Akash,
I understand that this folder will grew up when I go in my catalog. That's the normal process.
But I've change the catalog parameter to "delete the previews witin 1 day" (something like this because i'm using the french LR classic)
That's why I don't understand why the files are never deleted in the folder.
A few months ago (maybe 2 months) I have deleted all this folder.
And now, it still weight 43go! So I think the previews are never deleted.

And I don't want to have my catalog on an external (and unsecure) drive. 😉

Thanks
Stéphane

[Akash Sharma · Accepted solution]

Thanks for the heads up Stéphane.

Source: Optimize Lightroom performance

The default setting for when the large 1:1 previews are deleted is one week. The size of the preview file is reduced when these large previews are deleted, but the entire file isn't deleted unless you manually delete it.

The file doesn't become huge unless you rarely or never delete the 1:1 previews, but whether it affects your hard disk depends on your available hard disk space. You can change how often the 1:1 previews are deleted by choosing Edit > Catalog Settings > File Handling (Windows) or Lightroom > Catalog Settings > File Handling (Mac OS).

Note: If you delete the Previews.lrdata file, previews are recreated for each folder or collection you open in Lightroom, so the first time you work in a folder, you'll experience some delay while previews are recreated.If the option to Automatically Discard 1:1 Previews is set to Never or After 30 Days, your preview file can get very large. It can take up many GB of space.

If your hard disk suddenly gets full, check the size of this file. You can then delete the file. You may get an error in Lightroom that indicates a problem with the cache; this is another time you'd want to delete your previews.lrdata file.

If the above settings are not working to discard the previews automatically, I'd suggest that you delete the previews.lrdata file once as it might've grown bigger in size than it should and have already started causing issues.

Going forward, note the pattern how Lightroom is discarding the previews as per the selected setting you have.

~Akash