Lightroom: Unable to merge some photos (which merge in Photoshop)

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  • Problem
  • Updated 2 years ago
  • (Edited)
From time to time I'm having problems merging photos to panoramas. It says: "Unable to merge photos. Please cancel and review your selection.". If I try to merge the same photos in Photoshop it works fine. The photos seem to be suitable for merging in my eyes since the overlapping area is almost half (sometimes even more) of the picture. Generally I dont mind merging in Photoshop, but I would love to use the boundary wrap feature which I think is not available in Photoshop.

These 2 photos won't merge in Lightroom but in Photoshop they do (see below). They were taken with a Nexus 6P but I am having the same issues with some pictures taken with a D750.
Photo of Dominik Thamm

Dominik Thamm

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  • frustrated

Posted 2 years ago

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Photo of Chris Castleberry

Chris Castleberry, Camera Raw Engineer

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Official Response
Yes, the issue is with the non-uniform source image dimensions. Either the camera is automatically cropping JPEG images to slightly different dimensions, or some intermediary step is doing so. If you attempt to merge the raw (NEF) images from the camera I suspect the dimensions would be identical.

Merge Pano/HDR in Camera Raw and Lightroom is more restrictive with source images than Photoshop is. This was done to simplify the implementation. It's possible that we may loosen the requirements in ACR/Lightroom in the future, but no guarantees.


- Chris