Lightroom: Importing with Embedded & Sidecar produces produces bad previews ignoring develop settings

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  • Updated 3 months ago
Importing JPEGs, TIFFs, and PSDs with the option Build Previews: Embedded & Sidecar builds Library previews that ignore develop settings contained in the photos' metadata.  The only way to get correct previews is to delete the catalog's Previews.lrdata and restart LR.

To reproduce:

1. Create a new catalog.

2. Uncheck the options: 

Preferences > General > Replace Embedded Previews With Standard Previews During Idle Time

Catalog Settings > Metadata > Automatically Write Changes Into XMP

3. Import all 8 photos from this folder, using the options Add and Build Previews: Standard:

https://www.dropbox.com/s/wmiqxhzsfs2jbxe/embedded-sidecar.2018.09.24.zip?dl=0

4. Observe that they all have the develop setting Exposure = -3 applied:



5. Remove these from the catalog (but not from disk).

6. Import the 8 photos with the options Add and Build Previews: Embedded & Sidecar. 

7. Select all of them and do Library > Previews > Build Standard-Sized Previews.

8. Observe that p.jpg, p.psd, and p.tif don't have correct previews showing the effect of Exposure = -3:



9. Restart LR and observe that the three previews are still incorrect.

10. Exit LR, delete the Previews.lrdata file/folder, restart LR, and wait a few seconds.

11. Observe that all the previews are now correct:



Tested on LR 7.5 / Macos 10.13.6.



Photo of John R. Ellis

John R. Ellis, Champion

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Posted 3 months ago

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Photo of Sreenivas Ramaswamy

Sreenivas Ramaswamy, Employee

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Hi John,

thanks for reporting this. We will look into this.

Thanks
Photo of Jim Wilde

Jim Wilde, Champion

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Thanks John, following your revised steps I do see the problem with both your images and my own files. I did also note that a simple one click forward and one click back on the Exposure slider in Quick Develop clears the problem and builds the Standard preview, without having to trash the previews cache.
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Jim Wilde, Champion

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John, a couple of things that you may have already observed. None of those 3 images show the Embedded Preview icon in the Grid or Filmstrip. If I select any or all of those three images and attempt to build either Standard or 1:1 previews LR reports none built as they already exist. If in Library I zoom to 1:1 on any of those three images, the Loupe and Filmstrip preview does then update, and that's an immediate update, there is no "Loading" delay.

It almost seems as though there is no Embedded Preview in the file (or Classic fails to read it), and consequently a full Library preview tree is created during import (but not updated with the develop settings). Making a subsequent develop change causes that preview to be replaced with a new standard preview, as expected.
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John R. Ellis, Champion

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Putting the files under the Exiftool microscope:

The PNG, which is handled correctly, doesn't contain an embedded thumbnail or preview.

The JPEG, TIFF, and PSD, which aren't handled correctly, contain 171 x 256 thumbnails, but LR isn't using these as the embedded previews (which you can see by opening them in Loupe).
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Sreenivas Ramaswamy, Employee

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As the thumbnails are very small compared to the actual size of the image they are not being treated as embedded previews.