Skip to main content
P
phil_pav
Participant
April 29, 2026
Question

Panorama stitching often fails with many RAW images.

  • April 29, 2026
  • 1 reply
  • 19 views

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

 

 

    1 reply

    Nadeem28230335k4xr
    Nadeem28230335k4xr
    Known Participant
    April 29, 2026

    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.

    P
    phil_pavAuthor
    Participant
    April 29, 2026

    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). 

     

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices