Height2bump takes in a grayscale Poser-style bump or displacement map and produces a normal map. See the attached image. I know the script name is confusing, from our Poser POV. I've retained the confusing naming of the source script, to honor that source. But... confusing. I assume the way he uses the terms "height map" and "bump map" reflects some kind of industry standard or other, somewhere out there in the 3DCG world. And to them, we would be the weirdos! So it's like Bizarro World and everything.

I really am babbling now. Hmm.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.