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HueKeyer

This node is a chroma keyer. It calculates hue from the incoming red, green, and blue channels, and uses the amount curve to determine the value to output in the alpha channel. In the graph, the x axis represents hue and the y axis the alpha value for that hue. To key out a particular hue, find the hue on the x axis and Ctrl/Cmd+Alt+click to create a point on the curve at that location. Then drag the point up to a value of 1 on the y axis to set that hue to black in the alpha channel.