In-camera toning of monochrome files?

[Keith (M)]

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I have had my M10M since early Feb 2020 but it was only yesterday that I tried out the jpg/sepia toning.   It was only out of curiosity and it is also is out of curiosity to wonder how is the toning  created, given the pure grey-scales of the Monochrom sensor?  Presumably a similar process as to how Silver Efex Pro 2 creates toning?  

(I have put the question here as it may well have greater visibility than in the Monochrome section).

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[wda]

I am only guessing that the filter must distort, or falsify, the numerical descrption of the tones being recorded.

[250swb]

Silver Efex creates tones because the file has to be RGB to start with, you can't tone a Monochrom .dng greyscale file without opening it and converting to RGB first. So the camera must be using the in camera JPEG in a proxy RGB mode to make the sepia tone?

Edited December 3, 2022 by 250swb

[Keith (M)]

Interesting.  I just edited a .dng from my M10M in SEP2 and was able to select from the wide variety of toning available.  On opening in SEP2 the dng seems to go through 'pre-preparation' processes which presumably is where it is converted to RGB.  From that it would seem that the in-camera jpg is in RGB when toning is selected.  Opening a sepia-toned jpg from my recent little outing in LR Classic the 'Saved Preset - Treatment' is shown as 'colour', so I think that answers my question - the in-camera toned jpg's are converted to RGB 'on the fly' so to speak.

M10M .dng opened in SEP2 and given sepia toning.

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[Bikie John]

Perhaps the Mono raw file is bathed in potassium ferricyanide, washed, then bathed in sodium sulphide? It's amazing what modern cameras can do, after all

John

[250swb]

It's something I'd never considered even after owning an MM and an M246 probably because I'd always processed the .dng file as an RGB TIFF anyway. Maybe it's years of using a darkroom but there are very few photographic papers that print as 'greyscale' and many that have a very obvious warm or cool tone as a way of interpreting the image.

Edited December 4, 2022 by 250swb

[wda]

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Bromesko?

[250swb]

Or Agfa Portriga