Key Mode
Changes all colors that match the Key Color into black, all other colors into white. For use in the Alpha or Transparency channel.
Alpha Mode
Changes the alpha layer of the shader where the Key Color matches to transparent, leave the rest alone. Try it in the Color channel.
Key Color Picker
Range sliders
Two tabs each- typically centered around zero, these let you add a tolerance to your color, such as when the backdrop lighting isn't quite perfect.
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