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Photos and LrC previews almost same size on disk?

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fbx33

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Jul 3, 2015
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Lightroom Experience
Beginner
Lightroom Version Number
Lightroom Classic version: 11.2 [ 202201281441-a5b5f472 ]
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  1. macOS 12 Monterey
Does this make sense?
I imported the photos from folder "LR Classic Photos" to a new instal of LrC.
The photos take up 144 GB.
The LrC previews take up 97 GB.
This seems nuts to me but thought I'd ask.
Thanks for help--


Screen Shot 2022-03-25 at 152105.jpg
 
To determine plausibility:

1. Are the photos mostly raws, mostly JPEGs, some other type, or a mix? What is a typical size in megabytes for each type of file? (Just a ballpark will be sufficient.)

2. What is the exact setting for Catalog Settings > Standard Preview Size?

3. In the Import window, what is the setting for File Handling > Build Previews (in the right column)?
 
1. Photos are mostly JPG.
1b. Avg MB of orig pix is 5MB ( 145 GB or 145,000 MB divided by 29,000 pictures)
2. Std preview size is 5120 px
3. File Handling Build Previews is set to STANDARD (no other boxes checked under file handling)

Thanks
 
1. Photos are mostly JPG.
1b. Avg MB of orig pix is 5MB ( 145 GB or 145,000 MB divided by 29,000 pictures)
2. Std preview size is 5120 px
3. File Handling Build Previews is set to STANDARD (no other boxes checked under file handling)

Thanks
If you photos are JPEGs, then this makes sense. Previews are also jpegs and because the previews are a pyramid of different sizes, they won't be that much smaller than the originals in that case.
 
Std preview size is 5120 px
Is the precise setting "Auto (5120px)"? Unless you have a 5K display, the actual resolution of your display is very possibly significantly smaller, and you can choose a smaller value for Standard Preview Size that matches the resolution of your display, reducing the size of your previews by quite a bit.

You can see your display's resolution by clicking the menu in the upper-left corner, selecting About This Mac, and clicking the Displays tab:

1648317993705.png
 
Didn't mean for this to be so large. Would it be advantageous to reduce the resolution of Standard Previews?

Screen Shot 2022-03-26 at 145655.jpeg
 
Last edited:
Your display is 5120 pixels wide, which is about the width of a JPEG from a newer camera, so a standard-sized preview (which is a JPEG) of width 5120 (along with the "pyramid" of smaller-sized previews LR also generates) will take about the same space as the original photos.

If your JPEGs are all significantly smaller than 5120 wide, you could set the size of standard previews to be their width and save a significant amount of disk space.
 
If you default your previews to "Minimal", LrC will create bigger ones if and when you need them. for example, using Loupe view at or near full screen or taking the image to the develop module. But, for majority of images I suspect you don't do that.
 
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