Channel mapper
The Channel Mapper node can be used to map the RGB channels of an input texture to a new RGB channel order. The same input channel can be mapped to multiple output channels. In figure 2, the Channel Mapper node is used to map red, blue, and green from an incoming texture map into the same (0) channel for the plane on the right.
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Channel Mapper
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Figure 1: Channel mapper Node
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Channel Mapper
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Figure 2: A Channel Mapper node example
Channel Mapper Parameters
Input - Specifies the image for the operation.
Red channel index - The input channel index to map to the red output channel.
Green channel index - The input channel index to map to the green output channel.
Blue channel index - The input channel index to map to the blue output channel.