Height map color to grayscale

[maje90 (Riccardo Majewski)]

Strictly related:

Transfer RGB gradient to height

I know that there has a way to transfer height information to RGB gradient. Is there any way to do it opposite? I found a temperature map and want to create a 3D geometry based on RGB information which means that each different RGB corresponds with different height. Moreover, I want these corresponded height to match the original legend bar very well [RGB%20to%20height] RGB to height.gh (647.3 KB)[legend%20bard] Any suggestion is appreciated! Thank you