Lightroom 2015.7: Forcefully rendering 1:1 previews in Library mode

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  • Updated 2 years ago
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This issue is occuring on both my desktop (LR version 2015.7) and my laptop (LR version 2015.6.1) On both, Lightroom (and its catalog/previews) are being run from a SSD.

So, little background, I'm a professional photographer. Been doing this for years, and I've got a nice LR workflow developed that has worked well for years. But today, today I'm stumped and it's driving me insane.

So, the usual process is to upload RAW photos to HDD, then render "Standard Previews" in Library (Which is medium quality, 1,440 pixels) and then scroll through and flag keepers. I can usually switch photo to photo near instantly and this has been my usual method for quickly culling. Been doing it that way for years.

Until now. Now, despite having rendered standard previews (and discarding any 1:1 previews as well as smart previews) Lightroom insists on, as I go photo to photo, reloading them from the RAW file and trying to do it at 1:1. My culling is now horrifically slow and I'm ready to pull all my hair out.

Before, I could cull in Library just fine having rendered standard previews. Now it always tries to load 1:1. Why?

This seems to have come about in the last few days, as far as I can tell. 

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Jason Comerford

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Posted 2 years ago

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Simon Chen, Principal Computer Scientist

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What changed in your setup? Monitor resolution changed? Catalog Settings>File Handling>Preview Cache>Standard Preview Size change? Raw files with different image dimensions?
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Jason Comerford

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RAW files with different image dimensions, actually! I borrowed a Canon 5Dsr, which spits out 50 megapixel RAW files, vs my usual setup which has been the Canon 6D / 20 megapixel RAW files.

But the sessions I'm now culling (and having the trouble with) are all just 6D RAW files, I haven't even touched the sessions with the big ones. (Other than uploading them onto my computer using Lightroom)
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Jim Wilde, Champion

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A possible explanation is that your selected standard preview size of 1440 px is no longer adequate, i.e. the actual loupe viewing area on your monitor is more than 1440 px wide. Thus the standard preview cannot "Fit" or "Fill" the viewing area, which forces Lightroom to render a 1:1 preview instead. Something has changed, which is what Simon was looking for, but it could have been something as trivial as dragging one of the side panels a few pixels smaller, which in turn could have enlarged the loupe viewing area beyond that 1440 px width.
You could change the preview size to the next size up (or use "auto"), then force Lightroom to re-render standard previews for a bunch of not-yet-examined images, then see if that fixes the problem.
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Jason Comerford

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I actually had that though too, Jim. I measured the image size in the loupe view, and it's around 1,100. It shouldn't need to render a new preview in this case, should it?
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Jim Wilde, Champion

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No, not if that measurement is reasonably accurate. All I can suggest is to do the test I suggested, i.e. increase the standard preview size, then render standard previews for a selection of images, then see if browsing from image to image works smoothly.
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Just Shot Me

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I must ask. Have you selected, clicked, FIT at the top of the left hand panel in the Navigator section?
Is there a hand visible for the mouse cursor when the mouse pointer is in the image display area? If there is then click the screen and the view will go to FIT instead of 1:1.
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Jason Comerford

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FIT is currently selected. When I bring the mouse over to the image area, it turns into a magnifying glass.
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Carlos Cardona

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Your import method is confusing: "then render "Standard Previews" in Library ", huh? Then? If you select create Standard Preview when importing it does it as you import, not "Then", which implies later.

"despite having rendered standard previews (and discarding any 1:1 previews as well as smart previews " -Huh? Don't discard Standard Previews! Why would you do that anyway, they are tiny files! Lightroom is probably trying to replace these files that you discarded in a fit of unnecessary cleaning. Create Standard Previews on import and LEAVE THEM ALONE.
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Jason Comerford

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I don't render standard previews as I import, I do it afterwards. On import, it only builds minimal previews to speed up the process. (I do this late at night, usually, after coming home from a wedding with several thousands of photos, I prefer to do it a bit faster so I can go to bed.)

Aaand I don't discard standard previews. I earlier *discarded 1:1 previews* and *smart previews* as part of a troubleshooting process I went through with Adobe. My point in mentioning that was to show that Lightroom only had standard sized previews to load up, and instead of doing that, it tried to render full 1:1 previews.
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Jim Wilde, Champion

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You can't actually discard standard previews, like you can with 1:1 or Smart Previews. To get rid of standard previews you'd have to delete the entire previews cache.