RGB Mattes Setup


  1. Create 3 new Surface Shaders.
    1. Assign one primary color to each shader and rename accordingly MatteRed, MatteGreen, and MatteBlue
  2. Create a new render layer, and name it something appropriate (RGBMatte_layer, for example)
  3. In that layer assign the Surface Shaders to a parts of the geometry that you wish to affect in 2D
  4. Render out a test frame of that layer to ensure that everything is working as expected


After Effects

  1. ┬áIn an After Effects file that has a “beauty” pass ready to receive 2D treatment, create an Adjustment Layer (Layer > New > Adjustment Layer) and ensure that it is sitting directly above the “beauty” pass in the timeline
  2. With the Adjustment layer selected, add a color correcting effect (Hue/Saturation, for example)
  3. Add the RGBMatte layer directly above the Adjustment Layer.
  4. With the RGBMatte layer selected, add a Set Matte effect to the RGBMatte layer (Effect > Channel > Set Matte)
  5. In the Set Matte effects controls
    1. Ensure that the Take Matte from Layer parameter is set to the RGBMatte layer
    2. Ensure that the Use for Matte parameter is set to the color channel that you wish to employ
  6. In the Timeline, under the TrkMat column, set the Adjustment Layer’s TrkMat to Alpha

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