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

This effect works with 8-bpc color.

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.

Add, Subtract, Multiply, and Difference

Apply basic math functions.

Max

Set the pixel’s channel value to the greater of the specified value and the pixel’s original value.

Min

Set the pixel’s channel value to the lesser of the specified value and the pixel’s original value.

Block Above

Set the pixel’s channel value to zero if the pixel’s original value is greater than the value specified; otherwise, leave the original value.

Block Below

Set the pixel’s channel value to zero if the pixel’s original value is less than the value specified; otherwise, leave the original value.

Slice

Set the pixel’s channel value to 1.0 if the pixel’s original value 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.

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.