Discarding 1:1 previews does not reduce size of preview folder

New Here ,
Feb 15, 2022 Feb 15, 2022

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I recently discarded all 1:1 previews through the Lightroom menu. However, the size of the preview folder in the explorer has not changed. I have restarted Lightroom as well as the computer without any effects. 

 

I know I could just delete the whole folder manually, but I rather not want to discard the standard previews. 

 

Lightroom Classic 11.2

Windows 10 Pro 21H1 (OS build 19043.1526)

 

Thanks in advance for any pointers on how to fix this issue.  

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Adobe Community Professional ,
Feb 15, 2022 Feb 15, 2022

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Lightroom only builds a 1:1 preview if you zoom into the image 100%. By default it also discards 1:1 previews after one month. So most likely you did not have that many 1:1 previews to make a real difference in size.

 

-- Johan W. Elzenga

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LEGEND ,
Feb 15, 2022 Feb 15, 2022

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I don't think the 1:1 previews are discarded IMMEDIATELY when you use the menu to discard them.  It used to take weeks to eventually remove them.  Maybe that is still the same.

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Adobe Community Professional ,
Feb 15, 2022 Feb 15, 2022

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This action isn't instantaneous. You should maybe let LR run overnight, but eventually, the previews will be discarded if requested.


Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

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LEGEND ,
Feb 17, 2022 Feb 17, 2022

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LR will only discard a 1:1 preview if its width is 2 or more times the width of your standard-sized previews; otherwise, LR keeps the 1:1 preview to use as the standard-sized preview.

 

So if your 1:1 previews are 4096 pixels, and your standard-sized previews are 2560, discarding the 1:1 previews will have no effect (since 4096 < 2 * 2560).

 

It's been a while since I've seen this come up:

https://www.lightroomqueen.com/community/threads/discarding-1-1-previews-doesnt-shrink-lightroom-cat...

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