Huh?

You mention JPEG size limits.

JPEG size is not affected by PPI, and if we have any hope of clarity in this conversation, it would help if we stopped mentioning DPI. There is no DPI in JPEG. The "Dots" in "DPI" refer to the printer inking resolution, at the sub-pixel level, and usually is 1200 to 4800 DPI. This has nothing whatsoever to do with PPI, or total pixel size, or JPEG size.

I see, also, you edited your previous post. When I saw it and quoted it, there was only "150 dpi" in there.

Round and round we go. :-)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)