How big an image can iPhoto handle?

I suspect a problem I am having importing large panorama images into iPhoto is due to some aspect of the file or image size.
I have been working today with a 50000 x 4000 pixel image, which comes out to 897MB as a .tif file from photoshop. This will not import [unreadable file dialog comes up and says these files could not be imported and import failed].
If I open the image in preview and save it as a jpeg (can't do this directly in photoshop because it will not save documents larger than 30000 pixels in any dimension as a jpeg), it comes to 172MB and will not import [same error dialog].
If I reduce the size to 30,000 pixels x 3,000+ a bit, save it as a jpeg, now 44MB, it imports just fine.
And thinking I had figured it out, I played a little more with it:
I took the large pano, opened the full sized tiff
file in photoshop, made files of 29999, 30000, and 30001 pixels max
dimension. The first two were saved directly as jpegs, the third as a
tiff file that was opened in preview and saved as a jpeg from within
preview, which does not appear to have a size limit as does photoshop.
Then I tried to import 29,999.jpg (17.8 MB), 30,000.jpg (17.8 MB),
30,001.jpg (20.2MB) and 30,001.tif (322MB) into iPhoto.
Guess which imported successfully?
30,001.jpg and 30,001.tif.
I am very confused.
[Apologies for the duplicate posting--started another thread on this same issue when I thought the .tif file type was the problem, but since I'm now more concerned about file size, I am reposting with a new title.]

Apple expert insists that the problem is in my image and not in iPhoto, that it has no photo dimension or byte size limits.
Since it has increasingly happened to me as I get more confident in making larger panoramas, I think there is something less robust about file handling for larger images, but the official word is that it is all in my head. Or my camera. Or my photoshop. But not iPhoto's fault.

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