rick.lang wrote:Is it fair to say that having two less stops dynamic range than the 4.6K sensor means that limiting the ProRes to 10bit flavours will produce a very similar image to a 12bit ProRes on a 13 stop sensor anyway? Does the lower dynamic range imply lower ProRes bit counts are completely reasonable?
The dynamic range and the bit depth aren't related that way.
12 bit ProRes is IMO pointlessly large. If you're going for ProRes, you might as well use 422 HQ; that's going to give you plenty of detail for most situations. In cases where you need more detail than that, you might as well just use raw.
rick.lang wrote:If ProRes 444/XQ is available, I’ll use it. But I am so used to the transcoding workflow (and ACEScct grading) associated with raw, not having the 12bit ProRes options isn’t a deal breaker.
I suspect that 4K cDNG at 4:1 compression would be significantly smaller than ProRes XQ at the same resolution... and might not be much bigger than HD ProRes HQ.
ProRes wasn't really made to be super efficient as far as taking up space, it's designed to be computationally lightweight.