Two plane DNGs seem to be broken

[pedrocr]

A user submitted some RAF converted DNGs from Fuji cameras with EXR sensors (they output two images per file to do HDR). The current RAF decoder just ignores this second image whereas the DNG decoder seems to be broken with these files (totally black output):

https://github.com/klauspost/rawspeed/commit/33ed64a96df800647915e367d50b1e3e752ff7e5

I had a look around and it seems the DngDecoder already tries to work with these so it must be a bug. Looking at it some more I wonder if we should output 2 RawImage files from these instead of just one where each of them is a normal cpp=1 CFA output so raw developers can treat these the same as any other.

[LibRaw]

This issue was reported as #45 and closed on Jan4?

[pedrocr]

What @klauspost describes there is indeed happening but the output seems to be completely empty so it's not the same issue.