Lightroom Classic: Are there any ways to reduce memory pressure when generating panoramas?

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  • Updated 2 months ago
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I am running short of memory when LR generates panoramas. It doesn't cause errors, but my computer really slows down.

I have "only" 32 GB of RAM in my computer. (I put "only" in quotes because this seemed like enough, and was the most Apple offered in an iMac at the time).

I am assuming that there is nothing I can do about this. If I want to generate panos, I just have to put up with a computer that cannot be used (easily) for other tasks at the same time. But I welcome any thoughts.



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Alan Harper

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Posted 2 months ago

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Zigi Putnins

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how many images are you processing; what size?
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Alan Harper

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Lots, big
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James Hess

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Come on. "Lots, big" doesn't say anything. I'm using an old Windows computer with 8 GB RAM. I have processed panoramas using as many as 24 raw images. What are you really talking about? And how long does it take for you to process those panoramas?
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Zigi Putnins

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no it doesn't. I assume alan is not serious about fixing his issue...
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Alan Harper

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Neither Zigi's or James' comments are true. I am serious. And I wasn't complaining about the time, just trying to figure out what is going on. I responded quickly because I didn't think it was relevant how big the images are, or how many there are. The issue is the memory footprint for the task I am trying to make. (Oh, and BTW, I'm not sure for nitty gritty things like memory management that Windows has any bearing on Macintosh, given how different things are underneath).

The images are raw files from a Canon 5DsR and I have up to about 24 images in a pano.

I am a little surprised by the large memory footprint, of which about 50% is in "kernel_task" (less than 50% in the screen shot above, but often that much at times). This suggests that LR is asking the system for resources about equal to what LR is requiring -- which I don't quite understand. (I think it has something to do with using the graphic card for processing the image.)

My question wasn't: Why is the memory footprint so big? The answer for that is: because I am stitching lots of big files.

The question I was trying to ask was: Is there anything I can do about this?

I hadn't seen anything in this forum about this issue, but I just ran across an answer to a related question (Why are my panoramas so big?) that at least sheds some light on what is going on.

I suspect the answer to my question is: set up Lightroom to open files in Photoshop in 8-bit, and use Photoshop to stitch my panos.

A
(Edited)
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James Hess

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I have never done a 360° panorama. It was three rows of eight images. They were 24 MP NEF files.
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John MacLean

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You said "Canon 5DsR". Those are 50 MP. I haven't tried doing multiple rows with the "newer" Photo Merge. I know in the past that it only worked with a single row and if you wanted multiple rows you'd have to use something like PTGui.
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Robert Somrak, Champion

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Photo Merge in Lightroom works great with multi row panos.   I thought Lightroom ALWAYS did multi row panos.  
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John MacLean

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Robert, I "think" it just chokes if there's too much blue sky?
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Robert Somrak, Champion

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Thats different than "in the past it only worked with a single row".

 I understand the failure if a row is mostly blue sky as it has nothing to match.  I also see posts from people because it is not merging ocean shots  but that shouldn't be considered a glitch but just expecting too much from Lightroom Photomerge.   Lightroom Pano works great considering you end up with a RAW file.