Compositors are meant specifically for compositing other colors or maps. In image processing, compositing images refers to superimposing two or more images to combine them.

The following compositor maps are supplied with the software:

Composite: Composites multiple maps. Unlike Mix, Composite doesn't have explicit controls for the amount of mixing. Instead, it bases the mix amount on the maps' alpha channel.

Mask: A mask is a map itself, used in this case to control where a second map is applied to the surface.

Mix: Mix mixes two colors or two maps. You can adjust the amount of mixing using a blend level you specify. The blend level can be mapped.

RGB Multiply: Combines two maps by multiplying their RGB and alpha values.