FVerbaas posted at 3:24 AM Mon, 17 April 2023 - #4462442

I do not have ZBrush or other fancy tools or bump sets so for my Roxie dooldes I will have to live with what's there for Roxie, Poser and PaintShopPro.

To avoid local skin color(lightness) affecting bump I was thinking of using the current plain desaturated map and get the difference with a blurred version of same, with blur radius on the order twice the size of skin detail. The blurred area should have the average skin lightness and the difference be representative for the bumps relative to average skin level. 

Yes, this method is used to retouch skin imperfections in portrait photography and is called "freqency separation". I use it quite often and created some bump maps with it in photoshop.