Transforms do not align across brackets.

Question

I've been reading all the threads that have to do with vertical transforms not syncing, or syncing but not aligning. I've tried all the work arounds with the sync setting, etc. However.. If I do a vertical transform across 3 photos (both synced AND manually), all shot with the same exposure settings.. essentially 3 INDENTICAL photos, I get 3 vertical adjustments that don't align. It's visibly noticable tabbing between the photos. I even tried importing the SAME photo 3 times and doing both synced and indivdual vertical transforms and the result is 3 photos that will not align. I've never had this issue with LRC before, but it's killing my real estate photgraphy work flow which relies exclusively on having perfectly aligned, verically adjusted images to run through LR/Enfuse. At this point the only way I can make this work for delivery is to do all my editing without the vertical adjustments, Enfuse and output, then reimport the output file and make all the vertical corrections to flattened TIFFs and reoutput. This obviously is not ideal.  Is there going to be a fix for this? I am running the latest update (11.2), If not, can I go back to the 2019 version of LRC that worked flawlessly in the past? But seriously.. this shouldn't be an issue that's so far spanning 2 updates. HELP.

johnrellis · Answer

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Here's what I think is happening:

The auto transforms (Auto, Level, Vertical, Full) are likely "randomized algorithms" -- rather than try all possible transformations (which would take forever), they sample the photo randomly to get a very good (but not necessarily best) answer very quickly. (Photo Merge > Panorama is another command that uses random sampling to determine how to overlap the merged photos.)

So when you apply Vertical to multiple copies of a photo, that randomness will occasionally produce slightly different results.

As an experiment, I took 20 copies of a photo, applied Vertical to the first, then Synced Transform > Upright Mode to all the others. Repeating this many times, usually 1 to 3 photos were slightly different from the others. I got similar results when, instead of Sync Settings, I used Auto Sync.

To work around this behavior, apply Vertical to the first photo. Then Sync with Transform > Upright Transforms selected:

This copies both the Upright Mode (Vertical) and the actual parameters of the transform computed for the first photo, ensuring all the target photos are transformed in exactly the same way.

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