How to use color ramp RGB with black spots

[DNorman]

You could do this:

Maybe it is not what you are after.

You can also make a colour ramp with inputs and input images/paterns into the colour inputs, that way you can get the spots only in the blue for example.

A Color Ramp with inputs for Cycles

Perhaps you wanted to animate a color ramp, or wanted to vary a color ramp used for hair color based on texture, or whatever. You would need a color ramp node with color inputs. I don’t know if someone’s already done this, but I couldn’t find one. So I made one. This one has four stops. It behaves like the default Cycles color ramp set to Linear. There is no support for alpha. If people find this useful I might make some with more stops and perhaps alpha support. Happy ramping! Attachments […