Lightroom Classic: Size of exported Smart Previews

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  • Updated 4 weeks ago
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I use Lightroom's Smart Previews a lot, because it is very handy to have the possibility to edit and export photos from my laptop without having the originals connected. The originals are moved to an external HD after a while to save space.

But I discovered that Smart Previews don't always have the same size, at least not the "effective size". They are like small originals with all information intact. So if an image is cropped, the Smart Preview is cropped too, which makes it even smaller than it was initially. It was difficult to predict the maximum (without enlarging) exported size of a Smart Preview.

So I made a spreadsheet that calculates the export dimensions, so I can easily decide if a Smart Preview is large enough for an export job, or if I have to connect the external HD. It should work with all camera models and aspect ratios. I just fill in the cropped dimensions found in LR. The first time I also fill in the camera model's original dimensions.

I don't know if this is interesting to others than myself. But in case, I've shared the OpenOffice document in my Dropbox:

https://www.dropbox.com/s/irplymqh8u103a9/Smart%20Previews%20Export.ods.zip?dl=0

It should have been an iPhone app for that. Or even better: It should have been possible to see it directly in LR's metadata as we can with other previews.
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evikne71

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Posted 4 weeks ago

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Just Shot Me

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IIRC if you are working with only a Smart Preview you can't, Can Not, Export that image file. I may be mistaken on this but that is what I remember reading (I Never work with smart previews).
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evikne71

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Yes, you can. I do it all the time. And the image quality is just as good as from the original file (in my experience). But the export size is limited to ... well, that's why I made this spreadsheet.
(Edited)
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Ross

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This is a great tip for those of us trying to find ways to conserve disk space.  I will give it a try! Thanks!
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E. Dinur

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As long as you are willing to settle for 4 or 5 MP. You probably could have saved some money on your camera.
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evikne71

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My intention with exporting from Smart Previews was only meant for web sharing etc. where the smaller size didn't matter anyway.