What's the difference between the two EXR file formats? When should I use one over the other?
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1$\begingroup$ I'll just put this here: blender.stackexchange.com/a/18406/7777.. $\endgroup$– Jaroslav Jerryno NovotnyCommented May 19, 2018 at 22:29
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$\begingroup$ Have a look at OpenEXR in the documentation by clicking the link below. Hope that helps! :) OpenEXR $\endgroup$– SuryaCommented May 20, 2018 at 8:12
1 Answer
It was noted in the comments but in short, use Multilayer when you want to bundle multiple render passes in one file. It's worth noting that some programs can read EXR files, but not Multilayer EXR files. For this reason, I use OpenEXR for non-lossy high color depth renders, and pretty much don't use OpenEXR Multilayer. The main purpose of Multilayer is to keep all the corresponding passes together for each frame, which is useful for working with other compositing software that then extracs and uses each pass.
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3$\begingroup$ Worth noting that Photoshop can open Multilayer EXR with aid of free plugin ProEXR. Each EXR layer goes into a PS layer. Good plugin...works well. $\endgroup$– B LayerCommented Jul 14, 2019 at 16:27