[jaredsohn]

I agree that there are generally problems doing this; we had thought a bit about doing this at a previous job when testing an AfterEffects plug-in we were developing, but we didn't actually do it.

Just wanted to add that one technique that could allow this to work better when testing across different kinds of hardware / driver settings would be to share high-level results (i.e. for release 1200, these images seem okay) rather than actual images among testers. (So each tester would generate its own "correct" images.) Yes, it is possible that some of the images this other tester assumes are correct aren't actually correct on their machine due to the hardware configuration. But if you care about this, you would not be able to share test results, anyway. And you could still test actual rendering on different kinds of hardware in a separate pass.