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- Frustrated
Posted 1 year ago
Todd Shaner, Champion
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John R. Ellis, Champion
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On MacOS 10.12.6, I don't see the grey box, but I do get a huge virtual-memory leak after a minute or so of such clicking in Library Loupe:

Do you see a similar increase in virtual memory in Windows Task Manager? It may be that an allocation of virtual memory is failing on Windows, causing the grey box.
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Todd Shaner, Champion
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John R. Ellis, Champion
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It may have something to do with virtual memory. As I described on Mac, I can pretty quickly get LR to allocate 62 GB of virtual memory before MacOS warns me it's run out. LR isn't actually reading or writing this memory, since on a machine with 16 GB of physical memory, that would take a very long time, with lots of paging to and from disk.
My hypothesis: LR is incorrectly requesting that the operating system reserve very large blocks of virtual memory, but LR isn't actually using that virtual memory (not writing into it or reading from it). Maybe LR is getting an error from Windows when it requests more virtual memory and shows the grey box as a result.
It's been years since I read about Windows virtual memory, but I (very) vaguely recall that Task Manager may not show such reserved virtual memory until it is actually touched by the program.
Here's what the memory situation looks like on Mac:

Todd Shaner, Champion
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DirectX support was added in LR Classic and causing many different screen rendering issues. Perhaps this is another one caused by DirectX incompatibility. I used the below procedure (#2) to force LR Classic to use OpenGL and not DirectX, but the blank preview screen is still present with the 16500x2000 image file at 1:1 Zoom view with Use Graphics Processor checked or uncheked.
https://helpx.adobe.com/lightroom/kb/crash-gpu-directx-enabled.html
Do you see the same 1:1 rendering issue using a 16500x2000 image file?

John R. Ellis, Champion
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However, it may be that on Windows, the hypothesized incorrect VM request from LR is being immediately rejected by Windows with an error, causing the grey screen -- if this is the case, then it definitely won't show up in Task Manager. Or it could be that WIndows is allocated the VM but that Task Manager isn't reporting this allocated but untouched VM.
Or it could be that the VM leak on Mac is unrelated to the rendering issue on Windows.
Todd Shaner, Champion
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A file with dimensions of 65000x8260 or 65001x8259 will NOT open in LR CC 2015.12 or Classic so the actual limits appear to be 65,000 Pixels/Edge or 536.870912 Megapixels (2_29th Power).

John R. Ellis, Champion
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Adobe's documentation says "Files with dimensions greater than 65,000 pixels per side or larger than 512 megapixels.". I think they were thinking of "mega" defined to be 2^20, but as far as I can tell, nearly everyone else in digital photography defines it as 10^6. The definition of 2^20 is still used by some (including Windows) when referring to bytes. See here for more nerdliness: https://en.wikipedia.org/wiki/Megabyte
Todd Shaner, Champion
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Any size image file with a side >65,000 pixels or >536.870912 Megapixels will not Import into LR.
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Todd Shaner, Champion
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https://feedback.photoshop.com/photoshop_family/topics/lr-classic-noise-reduction-effect-not-display...
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Todd Shaner, Champion
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Todd Shaner, Champion
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Lightroom CC Classic 7.1 [1148620], Win 10 Pro, Nvidia GTX 1050 [23.21.13.9077]. With GPU enabled, some very large images will not display 1:1 in the main window. They will display 1:1 in window 2 Loupe. They will display in Develop module. Turning off GPU acceleration resolves the problem. I have tried switching color monitor profiles to sRGB without effect.
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