Arithmetic

The Arithmetic effect performs various simple mathematical operations on the red, green, and blue channels of an image.

arithmetic-straight

Operator: 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:

And, Or, and Xor: Apply bitwise logical operations.

arithmetic-and-rgb25
Operator: And, RGB: 25
arithmetic-or-rgb25
Operator: Or, RGB: 25
arithmetic-xor-rgb25
Operator: Xor, RGB: 25

Add, Subtract, Multiply, and Difference: Apply basic math functions.

arithmetic-add-rgb25
Operator: Add, RGB: 25
arithmetic-multiply-rgb25
Operator: Multiply, RGB: 25
arithmetic-subtract-rgb25
Operator: Subtract, RGB: 25
Arithmetic Difference RGB25.jpg
Operator: Difference, RGB: 25

Max: Set the channel value of the pixel to the greater of the specified value and the original value of the pixel.

arithmetic-max-rgb25
Operator: Max, RGB: 25
arithmetic-max-rgb100
Operator: Max, RGB: 100

Min: Set the channel value of the pixel to the lesser of the specified value and the original value of the pixel.

Arithmetic Min RGB25.jpg
Operator: Min, RGB: 25

Block Above: Set the channel value of the pixel to zero if the original value of the pixel is greater than the value specified; otherwise, leave the original value.

arithmetic-blockabove-rgb25
Operator: Block Above, RGB: 25
arithmetic-blockabove-rgb100
Operator: Block Above, RGB: 100

Block Below: Set the channel value of the pixel to zero if the original value of the pixel is less than the value specified; otherwise, leave the original value.

arithmetic-blockbelow-rgb25
Operator: Block Below, RGB: 25
arithmetic-blockbelow-rgb100
Operator: Block Below, RGB: 100

Slice: Set the channel value of the pixel to 1.0 if the original value of the pixel is above the specified value; otherwise, set the value to zero. In both cases, the values for the other color channels are set to 1.0.

Arithmetic Slice RGB25.jpg
Operator: Slice, RGB: 25

Screen: Multiplies the complements of the channel values, and then takes the complement of the result. The result color is never darker than either input color.

Arithmetic Screen RGB25.jpg
Operator: Screen, RGB: 25

Clip Result Values: Prevents all functions from creating color values that exceed the valid range. If this option isn’t selected, some color values may wrap around.

 

This is powerful if you know how to use it. You can create some stunning color edits simply by adding and subtracting numbers here. I highly recommend using this effect often.

(From Adobe Help Page) https://helpx.adobe.com/after-effects/using/channel-effects.html#arithmetic_effect

Image from Unsplash.com

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