Can someone please provide a practical example using the individual R(ed), G(reen) & B(lue) channel curves in the Tone Curve tool …
I use the individual channels extensively to colour balance my underwater photos.
I also use them to remove/add colour casts in photos.
If you want examples please message me directly 
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You can use them also for correcting oog colors. When red is oog then that’s mostly caused by a to low blue and/or green channel. Correcting this can put the pixelvalue inside the gamut. If you like the result is up to you 
I did play with it to understand a little bit more of the oog colors.
George
George
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@John-M - I use(d) them for tinting or for negative conversion.
https://forum.dxo.com/uploads/default/original/2X/7/7065acb709d0dd069328a43e829c7447d73150c5.jpeg
Australia, 1988
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Interesting to see the Mac UI … … … … … … … … Compared with Win;
…
Does the Mac version (of the Tone Curve tool) not have a “Tone Picker” ?
What’s the tool/panel shown just below the Tone Curve tool … the one with label starting with “Farbton” (which I believe means “shadows”) ?
Often tools in the Mac version seem to be implemented better than in the Windows version. To my eyes the tone curve feature seem to look better in the Windows version.
I am not certain what that panel with the three sliders does. However, Kanal means channel and Rot tone means red tone. Perhaps this a different implementation of the Channel mixer.
Mark
Curious:
The “Mac version” seems to correspond more to that of PL 6 or 7.
I can’t verify because I’m using Windows.
To me the channel lines going from top left to down right seems to be impossible with the rgb line going from down left to top right. Unless he has done something associated with a negative.
George
@Joanna crossed my post.
What do the channel lines mean?
George
They are just placed to show their presence. They have no relevance to an image
That’s a 2019 HSL tool. The capture I posted is a screenshot I took from the
original post
??? - So, the screenshot you posted is a screenshot from the original screenshot ?!
Sorry, Mr P, but I’m none the wiser … What’s “a 2019 HSL tool” ?
Hue, Saturation, Luminance tool of PhotoLab v2 and before.
PhotoLab v3 and later show it as a ring.
Remember? Tools (and looks) have changed since then…
I seem to have used, in 2019, an old version of PL (v2) for that negative conversion example screen, so actually, it was a 2017 HSL tool 
Sorry for the inconvenience.
My problem - - I was pretty slow on the up take !