Forbackground: My Lightroom desktop catalog has tens of thousands of photos and hundreds of collections. When I was first getting familiar with Lightroom Mobile, I synced all of my photos with the service. This was a mistake; I did not realize that this would result in large amounts of data filling up my mobile devices (I thought the service worked more like Dropbox, OneDrive, etc., where photos are loaded as-needed). My Lightroom Mobile photo library is now much too large to fit on my mobile device, and even partially syncing fills up my devices immediately. I want to clear out my library and start over.
Individually selecting each image in the web interface is not a practical solution. It is also not practical to keep all of the photos in Lightroom mobile and then delete unwanted collections from individual mobile devices, since this would involve deleting hundreds of events from each mobile device each time I set up Lightroom Mobile. I would like to clear my library and start over with a small number of synced collections.
This anser is seven years old, but comes to the top of the search. Can you please update this. How do I find preferances? From what app are you talking about? Light Moble on a phone? Can you please explain step by step how to do this? I do not need to see 4,000 iphone photos in LR. I want to turn off all sync between Apple Photos and LR moble and LR CC. Please be considerate and write clear instructions that normal people can understand.
Thanks! Actually, this clears it out for any iOS and Android devices that you have logged into Lightroom Mobile too. I did exactly as you said and then opened up Lightroom Mobile on my tablet, and all of the photos were cleared out.
I had the same question and found it easiest to work in LR Classic desktop, delete All Photos in Preferences In May 2023, there is no option to delete photos on Mobile iOS or Desktop version of Lightroom. So frustrating. My iCloud storage is full and I know that Lightroom has 23,000 photos syncing on it. I just can't find a way on the desktop or mobile to get rid of those photos or stop them syncing. There is no option to Delete all Data under preferences as this forum states.
In case you would like to UNSYNC a few photos, and not your entire catalog; Under the Libary tab, in the catalog 'all synced photos' you can right-click on the image, scroll towards the bottom, and select 'Remove from all synced photos'. this will unsync that particular photo or photos selected, and after about a minute to update, will disappear from all Lightroom Mobile devices.
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Terence Devlin already explained about the working copies that Photos is storing for lossless editing and to speed up the browsing. They are essential. Some applications are offering to "clean" your Photos Library and to remove them. Apple is warning about them, because they will damage the library: Using third-party apps to remove duplicate photos might damage your Photos for macOS library - Apple Support
Older versions of Photos had a cache for syncing photos to an iPhone or iPad. That has been the only cache that could be removed safely, but doing so, would slow down the next syncing considerably. This cache does no longer exist in Photos 5.0 on Catalina, because iTunes Sync has been replaced by syncing with the Finder.
I have 22439 photos on my iMac and have been told I need to clear the Photo cache - according to my advisor each time I edit a photo it retains the prior and subsequent copies - and that I need to "clear the cache" to free up space and/or memory. I do not understand this. I have ample storage left of the internal 1TB and plenty of memory of the 24GB installed.
Photos is a digital asset manager that is designed as a kind of digital darkroom. It is a parametric editor - that means that your original file is preserved and never touched. It's treated like a film shooter treats the negative. So, when you edit a snap the app notes the decisions you take in the database. If you export the shot then these decisions are applied to a copy of the original and you get the edited image as a result. But your original is preserved. This means you can always go back to the original and start over if you want.
For ease of use, and for the sharing mechanism, a preview is also created. That's a reasonable quality copy of the edited image and that's what you get when you send an image from Photos to an email say, via the sharing mechanism.
This is what Photos is designed to do. This is how it works. This is a feature not a mistake. There is no way to purge the preview or the original without significant data loss. Attempting to do so will corrupt your library, which will also lead to data loss.
None of this is remotely related to caching and no, you do not need to clear the cache, even if you do it will not recover an iota of disk space as it's all recreated the next time you launch the app anyway.
In the book Art & Fear (audiobook), authors David Bayles and Ted Orland share a surprising story about a ceramics teacher. This story just might reframe the way you think about setting goals, making progress, and becoming better at the things that are important to you.
At the end of the term, he was surprised to find that all the best photos were produced by the quantity group. During the semester, these students were busy taking photos, experimenting with composition and lighting, testing out various methods in the darkroom, and learning from their mistakes. In the process of creating hundreds of photos, they honed their skills. Meanwhile, the quality group sat around speculating about perfection. In the end, they had little to show for their efforts other than unverified theories and one mediocre photo. 1
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