Transform smooth gradient into stepped gradient ?

ng.aniki

Hi all !

I am working on some rock formation and I am looking for a way to basically transform this:

http://i.imgur.com/M2wXtPP.jpg

Into something like this (With a way to define the precision):

http://i.imgur.com/FNxzTsX.gif

I guess that slope blur could be a direction to solve this, but so far I could not get it to give me a good result, no matter what slope I use.

I know I can achieve something similar using a gradient map, but I am looking for a cleaner solution than hand placed gradient key.

ng.aniki

I got my answer, the node  called Quantize does what I was looking for