Camera Raw and Lightroom both have a hard limit of 10K pixels in either dimension...future upgrades may eliminate that limit, but it's a hard limit at this point in time.
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Thanks, Jeff.
To be fair, I suspect 10K
is quite generous for most people's use (and it's quite a bit more than Aperture allows).
The thing I found
most troublesome though was that (again - I'm speaking about the beta here) Lightroom simply ignored the images in my library that exceeded the 10K limit. They were just silently skipped during import. Given that I was working with a library of roughly 13,000 images, it took quite a while to figure out they weren't there, and then even longer to understand why.
I can easily cope with not being allowed to manipulate them using LR's tools because PS has no trouble opening images that large, but I would have liked to be able to use LR's asset-management features on them regardless.
In contrast, Aperture seems to have a limit of somewhere around 6500 pixels, but it will still import images larger than that and allow you to work with their metadata. Rather than simply ignoring them, it just gives you a blank "Unsupported Image Format" placeholder in place of a preview in the browser (thumbnails are still generated, however).