I wanted contrast in the chunks of ice, and I got it with two things: 1) a control point curve, and 2) ludicrous-ludicrous HSL color saturation. In fact, here’s a screenshot in-process, with the saturation tool selected for display:
All these shenanigans are, as you can see in the toolchain, before the conversion to monochrome with the gray tool, which was just the bog-standard perceptual mix of the channels. A crop to accentuate the horizontal-ness of the composition, oh, and to also remove the slight vignetting occurring in the corners, and 'ere y’go.
That’s the sort of warped thinking that goes into my monochromes…
Glad you like it, but now I think that I should have reduced the saturation by about 30%!
My latest attempt to achieve what I had in mind is still not right.
dt 3.6.1
I’m not good at B/W (though I love it). But this was such a nice shot that I couldn’t avoid to try it. Congrats!
BTW: time to clean your sensor!
Sloppy me … so sloppy (to say the least) that I managed to completely brick this camera a couple of months later while trying to connect a damn cheap macro extension tube
I did this mostly to show that you can use negative RGB channel settings in the gray output. I don’t know why the module on shows only positive settings. You have to enter a negative number to change the slide bar scale.
let’s say this is half way down the Equator…
… so sloppy (to say the least) that I managed to completely brick this camera a couple of months later while trying to connect a damn cheap macro extension tube 
