Some previews are not updated after modification of the files

[laurent_laveder]

Je traite un fichier panoramique en PSB dans LR et je l'exporte en JPG dans LR. Un aperçu est alors généré pour le JPG. Si je modifie les réglages du PSB et que je le réexporte en JPG dans LR, il arrive que l'aperçu reste le même et ne reflète donc pas la modification. Que faire ? Peut-on régénérer un aperçu manuellement ?

[laurent_laveder]

J'ai oublié de préciser que l'aperçu dans le module Développement est quant à lui mis à jour. C'est dans le module Bibliothèque que se trouve le problème.

[laurent_laveder]

Encore une chose : lorsque je génère une copie virtuelle, il arrive que l'aperçu de celle-ci est mise à jour !

[GoldingD]

Please list your workflow, step by step. Please be wordy. And please include screenshots (pictures can help)

[laurent_laveder]

Dear GoldingD, thank you for your help!
here is my workflow:
- I create a panorama in the panorama software exported in PSB.
- I developp it in LR and export a low compressed JPG imported in LR.
- Then, I modifiy the settings of the PSB in LR and export it again to replace the previous JPG file.
- Sometime, the preview of this JPG in the Library module doesn't change and looks like the previous JPG version. But in the Developpment module, the preview is up to date!
I found a way to correct this when I have the problem with a Virtual copy of the JPG: I create a new virtual copy which reflects the modifications and delete the previous virtual copy.
So I don't have any screenshot to share as I corrected the files with the problem!
I was asking if there is a way to regenerate a preview file?

[GoldingD · Accepted solution]

Hmm, in the back of my mind, I think I ran into that myself.

In the Develop module, you might try altering a setting, for example change the profile to Adobe Monochrome, then change it back to what you want (that one very obvious) or perhaps increase the exposure, then place it back. Anything in Develop that will trigger  a Library Preview creation. then decreasing it back

Trying to remember what occurred for me, I think selecting in Develop module a different image in the filmstrip, then selecting the troublesome image worked. But that was long ago.

[laurent_laveder]

You're a genious (but as a genouis you probably already know it...)! I've tryied by increasing the brightness and the comming back to the previous setting and the preview is up to date now. Many thanks! Best regards.