Using RGB Arithmetic

Use RGB Arithmetic to apply specific mathematical operations to the Red, Green, and Blue channels. All channels have an individual Operator list and Operand slider for specifying settings independently.

To apply an RGB Arithmetic filter:

1. Select the layer.
2. Choose Operators | Channel | RGB Arithmetic.

The RGB Arithmetic Controls panel appears.

The RGB Arithmetic Controls panel includes the following elements.

Operator

Specifies which mathematical operation is applied to the specified channel. For a complete list of options, see Operator List Options.

Operators are available for Red, Green, and Blue.

Operand

Specifies the intensity of the selected operator for the specified channel. The effect depends on the mathematical operator specified, but in most cases, 0% applies no mathematical operations, while 100% is full intensity of the selected Operator.

Operands are available for Red, Green, and Blue.

Blend

Specifies the percentage amount for which the channel effect is visible over the original layer. Values below 100% allow you to see the original layer.