Inspiring

Question

Good way to clean up old previews?

Forum|Forum|2 years ago
August 21, 2023
3 replies
13102 views

Lightroom Classic 12.5, Windows 11 Pro

My Previews.lrdata "file" seems abnormally large.

I had Lightroom delete any Smart Previews that might be lurking. I believe it found 72, and they're gone.

I did the same thing with 1:1 previews, so they're gone.

A search in the previews file shows around 250,000 preview files (standard?), which is 2 - 3 times the number of images in the catalog, about 70,000 of which haven't been updated since 2020.

Is there some intelligent way to remove old standard previews and other junk in the previews file rather than deleting the whole thing and making Lightroom start over?

I presume Lightroom always deletes any previews associated with a file it deletes, but is there a way to check or have Lightroom check that orphan previews DON'T exist in the catalog - and delete any that are there?

Windows

This topic has been closed for replies.

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DavePinMinnAuthor

Inspiring

In the end I concluded that the simplest solution is probably the best. I went back to having 2 catalogs. One for "good" images that have been culled, and one for Incoming images.

It would be nice if there was a way to import from one catalog to another, so all the stuff that's catalog-only and not persistent in the metadata would get moved too, but I haven't found a way to do that.

Abambo

Community Expert

In the end I concluded that the simplest solution is probably the best. I went back to having 2 catalogs.

By @DavePinMinn

That is, in my eyes, a complex solution. But if it works for you…

It would be nice if there was a way to import from one catalog to another, so all the stuff that's catalog-only and not persistent in the metadata would get moved too, but I haven't found a way to do that.

By @DavePinMinn

Whatever that means… When I'm travelling with my laptop, I use an external disk, where I import my catalog into my main system. Unfortunately, not all catalog data get imported (like publish services) so that I have an alternative solution for my two desktops.

ABAMBO | Hard- and Software Engineer | Photographer

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DavePinMinnAuthor

Inspiring

It has some advantages... It separates the previews from the real catalog from the Incoming stuff where there's a LOT of 1:1 preview generation and fiddling while doing culling. And when there's nothing in that catalog, I can blow away the previews file and everything is clean for the next import.

It also makes it automatic to send the good images to the backup when I import them into the real catalog.

It was always pretty painless, except for losing stacks, when I used it, but I kept reading "you should only have 1 catalog", so I tried it.

When you get home from traveling and import your catalog into the main system, can you import a SINGLE folder into the main catalog or do you have to import the WHOLE catalog every time?

Conrad_C

Community Expert

Not sure, but it might help to run File > Optimize Catalog. That’s supposed to clean up the database, and things like orphaned database entries. But I’m not sure how thoroughly that extends to the preview files that the database manages. However dj_paige is correct that there are probably multiple preview files per image, at the very least a standard preview and a grid thumbnail size preview, but more likely previews at multiple zoom levels and grid sizes that might have been used.

I just give up and throw out the entire .lrpreviews when it gets too big, even though that causes a delay when they are rebuilt as I view each folder again.

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DavePinMinnAuthor

Inspiring

Thanks for the replies... Yes, as the original topic said, I DID the Delete 1:1 previews AND Delete Smart Previews. Those are all gone presuming the deletes worked.

The catalog gets optimized every time I back it up, which is weekly. I'm not sure how thorough it is either.

If the only answer is to blow away the whole previews when it get unwieldy and rebuild it, I'll probably go back to a separate catalog for incoming images. Only the "good" images ever got imported into the actual catalog and I didn't see the rapid growth. And when there were no images waiting for culling, I could delete the previews file on the Incoming catalog and it was clean.

JohanElzenga

Community Expert

Using only LrC, the easiest way is to just trash the Previews.lrdata folder, but rebuilding them is time consuming. However, there is a plugin by Jeffrey Friedl that includes an option for removing redundant previews. You can read more about it at http://regex.info/blog/lightroom-goodies/bag-o-goodies

The option you would need to use is 'Delete cached previews...'

http://regex.info/blog/lightroom-goodies/bag-o-goodies#delete-cache

The latest version of Lightroom Classic regularly deletes 'out-of-date' previews already. Note that 1:1 previews are only really deleted if they are at least twice the size of standard-sized previews. If they are smaller, then Lightroom won't delete them but use them as standard-sized previews. Also note that there are different size previews per image, so 250,000 previews for 70,000 images does not mean this is all obsolete stuff that was left behind.

-- Johan W. Elzenga

dj_paige

Legend

In the Library Module, use Library->Previews->Delete 1:1 Previews

Typically, Lightroom Classic generates several different sizes of previews, which can be the reason you have 250,000 when you have about 70,000 images.

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bob frost

Inspiring

In the past the different size previews of an image were included in one file - the .lrprev file. As I understand, from a different thread, the use of separate size preview files only started in LR 13.5. DavePinPin is using LE 12.5, so the extra files he has should not be separate size previews. Its easy to see - just look in a preview folder. If it has all .lrprev files, there should only be the same number as your images. If it has loads of separate size files with no extension, then each image file should result in several several size files. My LR13.5 has produced six preview files for each image, with -80, or -160, or -320, or -640, or -1280 or -2560 at the end of each name.

After converting .lrprev files to the new format files, my LRC left 1349 .lrprev files untouched. I deleted these as I believed they were orphaned previews. After doing this I ran the 'Build Standard Previews' command and it said there were none missing, and LRC runs fine.

bob frost

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