Lightroom Classic: Face recognition can it be done on catalog & previews?

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  • Updated 6 months ago
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My LR Classic catalog  is stored on my MBP - but the actual pictures are stored on an external HD - do I need to have the External HD mounted in order to complete the Face Recognition ? or I could do the process on the MBP hard disk  using the previews ? Thanks !
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Posted 7 months ago

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Photo of Victoria Bampton - Lightroom Queen

Victoria Bampton - Lightroom Queen, Champion

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Normal previews won't work, smart previews would.
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Simon Chen, Principal Computer Scientist

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Victoria is correct. Normal JPEG based previews won't work in Lr's case because Lr needs to support non-destructive edit image workflow. Those JPEG
 previews could be cropped, rotated and transformed after applying the develop adjustments. Lr wants to run the face tagging only once on the original unaltered image data.