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Explanation for SIZE of Previews of 40GB in LrC ?

Forum|Forum|4 years ago
May 19, 2021
3 답변들
2102 조회

l work with Lightroom since more then 10 years and have accumulated many pictures as a professional press photographer. I work with Photoshop since 20 years.

in my LrC are 370'000 images at the moment, mostly RAW files. few JPG files kept from the early days.

l have a MacPro late 2013 with 64 GB RAM !!!

catalina, 3 units of DROBO 5D with lots of Harddisk space.

I do backups every day.

on the Drobo Master there are of course many more images which are not or not anymore in the LrC catalog.

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when starting LrC on my MacPro I can see like in the actual screenshot 19.2 GB RAm available

after editing images the RAM starts getting RED Color and LrC is slowing down.
i close all apps I don't need.

at some point l close LrC and restart it again to free up RAM.

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screenshot no 2 shows the Previes size is 40GB !!! FORTY !

so l think this is way to much.

but l have no idea how to reduce the PREVIEW SIZE.

>>> any idea to have LrC make smaller previews ?

l have tried a few setting but .... mmmhhhh no change.

hopefully some of you out there comes up with something ?

thanks in advance and

ciao

이 주제는 답변이 닫혔습니다.

J

Jao vdL

Community Expert

Only 40GB for 300k images is extremely small. You must have only tiny previews set up as standard or you're working on a low resolution display. I have 100k images and my previews are 140 GB. That is about the size I would expect for the size of my display.

giancatt.stmoritz작성자

Known Participant

.... you're working on a low resolution display. ...

no l have an Apple LED Cinema Display

see screenshot

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...Only 40GB for 300k images is extremely small.

but the 40GB fill up my RAM ? or not ?

thank you

J

Jao vdL

Community Expert

Ah. Yeah the cinema display is considered low resolution nowadays. I am working on a retina Mac Book Pro with a 4k monitor which necessitates much larger previews. The preview database does not take up space in your RAM. It just takes up space on your hard drive. They are there to speed up display of your images when browsing.

ManiacJoe

Inspiring

As John points out, things are working normally.

Since the preview folders are a cache system, if you need the space back, you can delete the preview folder while LR is NOT running, and the cache will be rebuilt as needed starting off at a much lower size.

Alternatively, you can transfer the catalog and its supporting subfolders to a different internal or external (not network) drive.

giancatt.stmoritz작성자

Known Participant

.. if you need the space back, you can delete the preview folder while LR is NOT running...

interesting. l have to try this.

thank you

J

Jao vdL

Community Expert

If you do so, you'll open up to a Lightroom interface with grey previews hat will slowly be recreated. Typically the database will grow over time to about the same size as before. Doing this really only makes sense if the size is outrageous which 40 GB isn't.

johnrellis

Legend

"in my LrC are 370'000 images ... screenshot no 2 shows the Previes size is 40GB"

That's normal and represents less than 2% of the total disk space used for your images.

With previews using 40.15 GB for 370,000 images, that's about 109 KB per image. (Previews for my catalog of 33,633 images take about 718 KB per image.) If your press images are mostly JPEGs of, say, 5 MB each, then 109 KB per preview represents about a 2% overhead for preveiws.

giancatt.stmoritz작성자

Known Participant

...If your press images are mostly JPEGs of, say, 5 MB each...

mostly RAW Nikon files NEF of professional cameras.

where can I see how large in k is a preview ?

thank you !

johnrellis

Legend

"mostly RAW mostly RAW Nikon files NEF of professional cameras."

So the disk overhead of the previews is even smaller, less than 0.5%.

"where can I see how large in k is a preview"

It's difficult to see the size of any one preview. But it's easy to calculate the average size: 40.15 GB / 370,000 images.

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