Bridge: Will ACR 7.2 cause Bridge to rebuild previews?

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  • Updated 7 years ago
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The new release of ACR (7.2) is available. If I install this new version, will it cause Bridge to rebuild the thumbs/previews?

Would Adobe please describe the rules by which Bridge uses to rebuild the previews. Is this camera-specific? How can a user know if bridge will choose to rebuild previews? This can get very tediously slow when attempting to use Bridge as an archive browser.
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Tony Field

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Posted 7 years ago

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David Franzen, Employee

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Official Response
Updating to 7.2 will not cause any extra preview rebuilds. The only preview rebuild I expect to be caused by the 7.2 update would be previews of RAW files from cameras that were not supported in previous versions of Camera Raw. If you observe otherwise, please let us know.

There are other reasons why Bridge may rebuild previews that don't have anything to do with the Camera Raw being updated--folders for which the cache has been purged, or folders browsed originally with the prefer-embedded-previews option then re-browsed with the high-quality option. Another thing that can cause previews to regenerate is if you browsed files previous to changing your Camera Raw defaults; re-browsing those files with new defaults will rebuild previews for files that do not have explicit settings (edits you made in the Camera Raw dialog and saved, in most cases, in sidecar files), but this would also happen if you re-browsed the files with 7.1 before updating to 7.2.

The way to check this is to make sure that before the update you browse a folder with 7.1 installed, make sure all thumbs and previews are generated by 7.1, then update to 7.2 and browse the same folder. If Bridge doesn't rebuild previews for that folder (and I don't think it will), but does for other folders, then the preview rebuilding is most likely not caused by the ACR update but by something else.
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Tony Field

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Thank you for this excellent description of the ACR/Bridge interaction and the process does make good sense. This is the first description of the process I have ever seen.

I am presently rebuilding my master archive of 700,000 images with the ACR 7.1 release which is a multi-week process over the networked drives (still 200,000 images to go - wish Bridge would allow more than 500,000 images in the cache to eliminate multiple master cache directories). It seems as though the migration from ACR 6.* to ACR 7 required that everything be reconstructed. From your description, I suspect that this was caused by the effective "change of defaults" from 6 to 7.

For future releases of ACR, it would be nice if ACR release notes would indicate under what circumstances the files would be rebuilt. Additionally, it would be excellent if a Bridge option could be provided to disable cache rebuilds due to changes in ACR or ACR options. This would allow high speed browsing of files (important for large archives such as mine) - any changes that might be made would be (usually) invisible on the thumb/preview 1024 images. Certainly, if the images are viewed 100%, ACR would have to be invoked under any circumstance but even then there is no need to reconstruct the thumbs nor previews.

Thank you,

tony