LR (15.8) wants to import photos a second time, despite choosing "only new"

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When attempting to import photos off of an SD card, LR does not detect that the photos have already been imported.
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Konstantin Kliakhandler

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Posted 2 years ago

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Rikk Flohr, Official Rep

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When you imported the images from the SD card the first time, did you rename them during the import? 
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Konstantin Kliakhandler

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Thanks for the reply!

I always prepend the dates to the file names, but this hasn't stopped LR from detecting the files as duplicates in the past...
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Rikk Flohr, Official Rep

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The three criteria for determining a duplicate are:

1. File Name
2. File Size
3. Date/Time Stamp

If any of those three fails, the file will not be considered a duplicate.  
Here's a quick test you can perform. Uncheck Don't Import Suspected Duplicates
Shoot one image on a camera memory card. Import it while renaming.
Shoot a second image. Import it with out renaming.
Shoot a third image and attempt to import it with the Don't Import Suspected Duplicates checked.  

I would expect the following to happen on the third image import (as it has worked like this as far back as I can remember): 

Image 1 - will reimport
Image 2 - will not reimport
Image 3 - will import
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Konstantin Kliakhandler

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Your assessment does not align with my experience (I have always renamed the files and yet LR did detect duplicates in previous versions).

Further, since the renaming is not done by hand but rather algorithmically according to well defined criteria, LR has the advance knowledge of what the files will be named after renaming the and can thus compare the final file names. Therefore, as long as I do not change the naming scheme, I don't see why renaming of the files should affect the process.
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Victoria Bampton - Lightroom Queen, Champion

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Last I checked, the File Name criteria is actually "File name at the time of import" as this is stored as part of the import hash. So yes, if you're renaming while importing or later, it should still be recognized as a duplicate.

Which camera and file type? I don't suppose something could have updated the files on the card? For example, I've had issues in the past when I've used Olympus' iPhone app to embed GPS data into photos.
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Konstantin Kliakhandler

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I'm on OSX, so not windows only. Canon Rebel T2i. One thing I suspect might be related is that I started converting to dng at import, at some relatively recent point.
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Rikk Flohr, Official Rep

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Konstanatin, after a little more testing, (including a test install of CC2015.0 to test Victoria's theory) and reinstall of CC2015.8. Behavior has returned to expected behavior.

I would recommend resetting your preference file.  If that doesn't restore expected behavior, I would recommend an uninstall of your current version and a fresh reinstall from the Creative Cloud App. Let me know how it goes for you. 
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Konstantin Kliakhandler

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Thanks Rikk,

What do you mean exactly by resetting the preferences file? Is it something I tick, or just delete/move the lightroom folder in ~/Library/Application Support/Adobe, or something else?
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Rikk Flohr, Official Rep

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Konstantin Kliakhandler

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Thanks, I have!

I will update as to whether this has resolved my problem.