So… to start off with, these regrades use the French trailer on the Blu-ray as reference.
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These ones use some assorted film cel scans I found on eBay.
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And these come from the telecine shots from the above post.
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Unfortunately some of the tests I ran came out with screwy results. These are the ones that didn’t completely fail.
I do have a copy of James Cameron’s Titanic Explorer, but I’m not sure how viable it is as a source, given it was released in November '98.