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Agreed again :)

I do agree :)

Merely quoting from the 5-years-old question: " I'd like to use this image for sensor testing purposes, and the object is pure B&W." - without knowing the exact setup, the best we can do is suggest things to try. Trying out what quality you get from the "scale BW" approach I outlined only costs about 5 minutes to write and check. Trying out an alternative "convert to HSV and use the V channel" (or Lab or whatever) approach costs another 5-10 minutes. So after half an hour you know what's best :-)

No need to discuss the necessity of demosaicing at all, I just wanted to share a possible approach to the actual problem described. I fully agree that in most scenarios you will want to go RGB->Gray. However, the thread opener was talking about "sensor checking", so I feel comfortable to assume that he knows what he is doing ...

Mact