Thank you for that, hborre. I'm curious as to what technique you used to gamma-correct in Photoshop. I use the GIMP - can't afford Photoshop, since I'm poorer than dirt buying all this content off here! - so I'll try to follow your instructions to achieve a displacement map. I'm assuming the d-maps were greyscale, right? Or does that matter? My understanding is that the bump and displacement channels don't use the colour information of the image, so greyscale saves memory overhead and gives those channels only what they need...

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks