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C
ckambler
Participant
September 18, 2021
Open for Voting

P: Face Detection doesn't work on negatives

  • September 18, 2021
  • 5 replies
  • 569 views

I'm currently scanning a bunch of old family photos, and inverting the negatives in Lightroom Classic using Negative Lab Pro. However, facial recognition doesn't work for any of these photos, presumably because the face detection is looking at the original negative files, not with the changes made in lightroom to make it positive? Does anyone know of a workaround for this? If not, my feature suggestion / bug fix would be: Allow Lightroom Classic to run the face detection on a preview of the file with changes so that it can properly recognize faces on negatives.

    5 replies

    DdeGannes
    Community Expert
    DdeGannesCommunity Expert
    Community Expert
    August 18, 2024

    @PierC , check the post by johnrellis above dated Sep 19, 2021 in this thread.

     

    Regards, Denis: iMac 27” mid-2015, macOS 11.7.10 Big Sur; 2TB SSD, 24 GB Ram, GPU 2 GB; LrC 12.5,; Lr 6.5, PS 24.7,; ACR 15.5,; (also Laptop Win 11, ver 24H2, LrC 15.0.1, PS 27.0; ) Camera Oly OM-D E-M1.
    P
    PierC
    Participant
    August 18, 2024

    Wonder if you have found a good solution as I am having the same issue, thanks.

    DdeGannes
    Community Expert
    DdeGannesCommunity Expert
    Community Expert
    September 19, 2021

    When you have completed your work with NLP you should create a tiff or jpeg to continue further work in Lightroom. This can be achieved by doing an export in LrC or by NLP.

    I guess you are using a scanner or your camera to have raw files for processing.

     

    Regards, Denis: iMac 27” mid-2015, macOS 11.7.10 Big Sur; 2TB SSD, 24 GB Ram, GPU 2 GB; LrC 12.5,; Lr 6.5, PS 24.7,; ACR 15.5,; (also Laptop Win 11, ver 24H2, LrC 15.0.1, PS 27.0; ) Camera Oly OM-D E-M1.
    johnrellis
    johnrellis
    Legend
    September 19, 2021

    You might suggest to the Negative Lab Pro author that he could enhance his plugin to mostly automate this process.

    johnrellis
    johnrellis
    Legend
    September 19, 2021

    The only workaround I can think of would involve some non-trivial technical scripting -- a sketch:

     

    1. Do Metadata > Save Metadata To File on the negative originals.

     

    2. Export JPEG versions of the photos, with the export option to put them in the same folder as the negatives and add them back into the catalog. 

     

    3. Run face recognition on the JPEGs and label the faces.

     

    4. Do Metadata > Save Metadata To File for the JPEGs.

     

    5. Use the Exiftool utility to copy the face rectangles and associated keywords from the JPEGs back to the negative originals.

     

    6. Do Metadata > Read Metadata From File on the negatives.

     

    One issue: Read Metadata From File is currently buggy and loses any crop angles you might have applied, and it may lose other metadata fields as well.  

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