Can someone explain to me what this is, how it works, and some practical uses for it? I have looked everywhere online and haven't found anything useful. Just wanna know if it's useful or not.
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1$\begingroup$ See blender-manual.readthedocs.io/en/latest/compositing/types/…. Practical usage - nearly everywhere. Yes, it is useful. As your question seems too broad clarify what exactly do you want to know about ColorRamp node. $\endgroup$ – Mr Zak Sep 26 '17 at 21:27
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$\begingroup$ "I have looked everywhere"... right... Here are a few examples blender.stackexchange.com/search?q=color+ramp $\endgroup$ – cegaton Sep 26 '17 at 23:46
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A Color Ramp is used for many different things. You will use it all the time.
Here are a few examples.
It can be used to mix many different colors.
It can be used to control how much of a texture you see ie Roughness (and other inputs by clamping the white and blacks).
It can also be used as a mask to mix two materials together. By clamping down how much falloff or fade you want your texture/mask to have.
There are more use cases but here are some to get you started.
