Lightroom CC not using generated previews on Develop module

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  • Updated 3 years ago
Lightroom 6 / CC don't use generated previews when in "Develop", only in "Library".

To reproduce:
Select some pictures.
Apply a preset.
Generete previews.
Press "E" (Loupe) and press forward - Lightroom will correctly use the generated preview.
Press "D" (Develop) and press forward - Lightroom will use an old preview briefly, while it calculates a new one.
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ariel martini

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Posted 3 years ago

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Simon Chen, Principal Computer Scientist

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This is as designed. In develop, the library (JPEG) preview is only used briefly while loading the original raw for further edits. For edits, Lr wants to render directly from raw, not the JPEG preview.
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ariel martini

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But the JPG preview is wrong.
I further explored this issue and it seems it isn't an old preview, but just a preview made roughly, with incorrect color settings, probably faster to be made. I understand that it should be a faster preview, but it shouldnt be used if there is a better preview available.

Here's a way to reproduce:

Import several pictures (preferably more than 5) - I'm using Nikon NEF
Apply a preset to all of them (For instance Lightroom Color > Cross Process 2)
Build previews
Go to Loupe ("E") and press forward (->) - Correct photo is displayed
Go to Develop ("D") and press forward (->) - Sometimes incorrect color is displayed briefly (Preview 1), followed by correct color / low res (Preview 2), followed by correct color high res (Preview 3).
I understand this behaviour is acceptable if you made changes to the picture, or if there is no available preview. But if there is a preview available, it should be used instead of building a new Preview 1.

I also found that if you move to the next photo quickly, it tend to use Preview 2 immediately, but if you wait for Preview 3 to be generated, it discards Preview 2, and go back to using Preview 1 for the next photos.

This really annoys my workflow, since i have to wait Preview 2 be generated every time i move to next photo.
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Simon Chen, Principal Computer Scientist

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Thank you for the feedback. I'll forward the info. Just FYI: Preview 1 is rendered from the JPEG preview from the library; Preview 2 is rendered from the lower resolution raw from the camera raw cache; Preview 3 is rendered from the full resolution raw.
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ariel martini

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If I disable Performance > Use Graphics Processor, the behaviour go back to normal. So the problem is in the generation of the first GPU preview.
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Andy Charnas

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I have this same problem. It is very frustrating as it slows down image evaluation a lot. Upon selecting an image, first there is a totally crappy preview, with wrong colors, etc. It takes a few seconds for the final preview to show up. And then it takes a lot longer, btw, for the 2nd preview to get to final resolution (ie it looks blurry for another few seconds).

I haven't tried this with the gpu acceleration off, but that is not a long-term solution anyway.

Overall impression is that LR CC is way slower than LL 5. A big step backwards.