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phil_pav
Participant
Apr 29, 2026 4:16 PM UTC
Question

Panorama stitching often fails with many RAW images.

I am using Lightroom Classic 15.3 and Lightroom (Cloud-based) 9.

I regularly take high-resolution landscape images (Sony a6300, ARW format) and merge them into panoramas. When I try to merge many RAW images (around 80), I occasionally get the error: "Unable to merge".

If I then select other adjacent images from the same photo set, the merge may succeed or fail. I'm not sure what causes the failure or what the requirements are for a successful merge.

I would be happy to provide sample RAW files to help reproduce the issue.

My setup:

Windows 10
NVIDIA RTX 4090
96 GB RAM

 

 

    2 replies

    Nadeem28230335k4xr
    Nadeem28230335k4xr
    Known Participant
    Apr 29, 2026 6:36 PM UTC

    I’ve had failures with 7 image panos and HDRs.  It starts the merge but then just hangs and never completes it.  I have to go to Lightroom Classic to do merges with more than 5 images.  To be fair, I haven’t had high image count merges since maybe two Lr versions ago so I don’t know how it does on the most recent update.

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    phil_pavAuthor
    Participant
    Apr 29, 2026 9:19 PM UTC

    I’m afraid it’s just the resulting sie that Lightroom can’t handle. I’m able to merge the images in Photoshop. When I try to import the panorama back (.psb) it tells me that the file size exceeds supported file dimensions (512 megapixels or 65k pixel long edge). 

     

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