R, G, B, A

Red, Green, Blue and Alpha channels

BgR, BgG, BgB, BgA

Background Red, Green and Blue channels

Z

Z Buffer Channel

Coverage

Z buffer coverage channel

ObjectID, MaterialID

The ObjectID and MaterialID channels

U, V, W

U,V and W texture map coordinates channels

NX, NY, NZ

XYZ normal channels

VectorX, VectorY

The forward X and Y motion vector channels to the next frame

BackVectorX, BackVectorY

Back X and Y motion vectors to the previous frame

DisparityX, DisparityY

Per pixel Disparity position between 2 images, normally stereo images

PositionX, PositionY, PositionZ

World position channels