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[jaapv]

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2 hours ago, Adam Bonn said:

actually @jaapv I just downloaded some monochrom dng samples and LR doesn't let me adjust the WB, so perhaps I'm not correct about the content of a monochrome DNG

However, the explanations I've provided for how LR/ACR works with colour RAW files is accurate (promise)

AFAIK the M9M uses linear DNG i.e.a (greyscale) LUT The reason was said to be the skipping of the demosaicing algorithm. It took Apple more that a year to accept this version of DNG and only Adobe got it right straight away.
One can only introduce colour for toning after converting to RGB, which LR cannot do as they only convert the DNG on export. 

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[zeitz]

4 hours ago, elmars said:

So I think a monochrome camera has an internal white balancing. 

Someone is going to have to explain this to me - how it works and what it adjusts.  How can a camera that has no idea of color temperature because it does not sense color, adjust for color temperature?  And what is there to adjust?  I can see a raw converter implementing a variable non-linear tome curve based, but that is not white balance.

[jaapv]

The tone curve is tweaked by the coating of the IR filter. 

[Adam Bonn]

Probably MC don’t need WB but it might be something adobe needs present to accept the dng file into its pipeline

I don’t own a MC camera, so I’ve never really delved into the nuts and bolts of one

[Adam Bonn]

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https://en.wikipedia.org/wiki/Chroma_subsampling

 

The jpeg Leica embeds into the M10M isn't devoid of colour info.... and "colour' (sic) needs to know the white point it needs. Also although we quite correctly think of WB as blue/yellow and green/red at a camera design level it also includes brightness values

you can adjust this luminosity if you use Lumariver (and probably other apps) to create DCP files

[jaapv]

A JPG is an RGB file, thus you can shift the luminosity between the channels which allows you to do toning or to apply the Prokudin-Gorkskii  method. But that does not mean that it is a file containing colour information.  It does not. And yes you can shift the white and black point, but, as the name implies has nothing to do with colour or colour profiles. It will balance the channels to equal RGB values.
You can turn any monochrome image onto a colour photograph. It used to be quite complicated, but possible, in Photoshop, however  now it is completely simple using AI and a Neural filter. It is all software manipulation though.