With the MultiMatte Channels Render Element , only three colors are possible: red, green, and blue. Compare with other matte render elements, which can include a multitude of colors to represent each material or object in a scene with a different color. With MultiMatte Channels , a single R, G, or B channel can be used directly as a matte, eliminating the step of selecting the color in the compositing software. This ease of use makes MultiMatte Channels a popular choice for compositors.

The Multimatte Render Element includes antialiasing.

To represent all the objects or materials in a scene with just the available red, green, and blue colors, several MultiMatte Channels Render Elements can be generated for a single rendering, each with different Material ID or Object ID settings.

Common Uses

The MultiMatte Channels Render Element is useful for isolating geometry in a scene. While other matte render elements perform similar tasks, MultiMatte Channels  is often quicker to use in compositing software because it can be made to include only pure red, green, and blue channels to represent objects in the scene. Compositing software often has a feature for easily selecting the red, green, or blue channels in an image for use as mattes.

MultiMatte Channels Render Element

Matte created in composite by using only the blue channel

Original Beauty Composite

Back wall color-corrected using matte created from MultiMatte Channels blue channel (as a mask in composite)