P: Don't import duplicates should recognize raw to DNG conversions

[toklas]

When Importing Raw files from SD-card, the "don`t import suspected duplicates" feature doesnt work, if I had converted to DNG before.

Scenario: I shoot 100 photos in Sony Raw ARW. I import them onto my notebook. 10 files i want to keep and i convert them to DNG to archive the files. Later i shoot 100 photos more. For backup reasons i have not deleted the photos from the SD card yet. I put the SD card with now 200 photos into my notebook and check the box for "don`t import suspected duplicates" and Lightroom will import 110 photos, instead of 100. 10 photos will be duplicates, but in ARW and DNG.

[Rikk Flohr: Photography]

Moving to discussions:

This is as-designed behavior.

For an image in your catalog to be considered a duplicate, it must:

1. Have the Same File Name and extension
2. Have the Same Capture Date/Time Stamp
3. Be the same physical size on disk.

Your second import of the ten previously imported images fails on items 1 and 3.

[toklas]

Understood, thanks for your quick response!
Can you move it to Feature Requests then?

[Rikk Flohr: Photography]

While I haven't tested it with Copy as DNG, I know this works under a Rename Scenario.

Import your images as raw to Lightroom without converting to DNG. 
After import, convert to DNG from inside of Lightroom 
Import the photos again - they should be recognized as duplicates. 


When you rename a photo on import, it comes into Lightroom as the new name. When you do it after import, it tracks both the old and new names.  It would be worth a try for your workflow to move the DNG Conversion to after import. 

[toklas]

Thanks!
But this is already my workflow.

"Import your images as raw to Lightroom without converting to DNG.
After import, convert to DNG from inside of Lightroom
Import the photos again - they should be recognized as duplicates. "

The "Don´t import suspected duplicates" functionality doesnt work in this scenario.

Maybe it would work when i convert to DNG during import, but this takes to long and is no option.

[Rikk Flohr: Photography]

If that is the case, I will kick this to Feature Requests and modify the title.