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The Extract RGB component extracts an R, G or B channel from the source image or color. R, G and B stand for red, green and blue respectively. The channels are extracted as grayscale images, where light areas correspond to higher channel values, and dark areas correspond to lower channel values. For more information on the RGB color model, see this Wikipedia article on the RGB color model. Extract RGB is a map component, it can be located in the Channels category on the Components Bar. This component can output HDR colors.
Provides the source image or color from which the specified channel will be extracted. This input can accept HDR colors.
Invert: Map Input
Inverts the extracted channel. When a map component is connected to this input, the state of the checkbox is determined separately for different image areas by the brightness level of the image supplied by that component. The brightness level of 0 to 50 corresponds to unchecked Invert, and the level of 50 to 100 corresponds to checked Invert.
Specifies a channel to extract: R, G, or B.