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Could you take us through your exact steps please, particularly how you are enlarging and your export settings.
Yes. I start with this image from within Lightroom. It's an NEF file.
I should also say, Lightroom Classic 10.0 being used on a Mac running Big Sur though it was also happening before I upgraded the OS on the Mac. It was not happening before I upgraded Lightroom Classic.
Works fine for me on macOS 10.15.7
What version of Lightroom Classic did you use and what were your export settings?
Strange, I did a couple other photos and they both exhibit the problem so I got one good result out of 3!!
BTW, PNG files seem like they take a LOT longer to export than they should. They take longer in Photoshop but in Lightroom they take an extraordinary amount of time to export.
I found that as well, I think it takes longer because it's adding all that extraneous data to the file. I'm relieved that someone else was able to duplicate the problem - proof that I am, at least, not crazy.
This is definitely a bug. The only thing I use PNG files for in LR are Identity Plates and Watermarks so haven't noticed it.
So to recap:
Tiff/PSD with Transparent Backgrounds
Exported at larger than original size exhibit this behavior.
Is that correct?
I would add PNG to that as well as I've imported PNG files and tried to export them larger and it exhibited the same error. So -
Exporting as a PNG larger than the original size exhibits the error.
I don't know if it's important but I think there is a threshold of enlargement as well. When I was troubleshooting I could successfully export if the enlargement was small - when I enlarged the large side form 6,000 p to 7,000 p it did fine, but going up to 8,000 p the error was there. That has been my experience anyway.
There should be a vid of the CSR attempting to correct the issue via my computer - Case number: ADB-16432718-F5M0 - if that's helpful and you run in those circles. I can't imagine it's all that exciting...
Thanks for the info. I will try to reproduce.