Adobe After Effects - Manual (Page 474)

Channel effects
To the top
To the top
Operator
And, Or, and Xor
Add, Subtract, Multiply, and Difference
Max
Min
Additional resources about Channel effects
Arithmetic effect
Blend effect
Calculations effect
Channel Combiner effect
Compound Arithmetic effect
Invert effect
Minimax effect
Remove Color Matting effect
Set Channels effect
Set Matte effect
Shift Channels effect
Solid Composite effect
Third-party effects in this category included with After Effects:
CC Composite effect
See Third-party plug-ins included with After Effects.
Additional resources about Channel effects
Satya Meka provides the Separate RGB effect plug-in on the After Effects Scripts website . This effect—which was written with Pixel Bender—
offsets, scales, and rotates each color channel of an image separately.
Chris Forrester provides a video tutorial on his website that shows how to use the Channel Mixer, Shift Channels, and Set Matte effects to create
mattes from color ID passes from 3D applications. He also provides an animation preset that sets up the parameters in the Channel Mixer effect for
the use of an RGBCMY color ID pass.
Arithmetic effect
The Arithmetic effect performs various simple mathematical operations on the red, green, and blue channels of an image.
This effect works with 8-bpc color.
The operation to perform between the value you specify for each channel and the existing value of that channel for each pixel in the
image:
Apply bitwise logical operations.
Apply basic math functions.
Set the channel value of the pixel to the greater of the specified value and the original value of the pixel.
Set the channel value of the pixel to the lesser of the specified value and the original value of the pixel.
470