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Hey Alfie,
This can be achieved in you material using the Blend_Difference node.
I grabbed this texture off google: https://s-media-cache-ak0.pinimg.com/736x/99/c1/9f/99c19fe9cb58c369f88761446d4d68fb.jpg
In my material I imported the both of them and grabbed the Blend Difference node which shows the color difference as seen below:
Now we just desaturate the result to get a black and white different node.
Thanks for the response! I’ve tried this before but just got pretty low quality results, which I presume may be related to my textures resolution, which is 256x256. Anyway, here is the result, which as you can see isn’t perfect.
Is there any other way to do this without the result being so distorted?
Thanks,
Alfie