Operator List Options

The Operator list appears in most channel effect controls. The options in this list specify which mathematical operation is applied to the selected channel.

The following operators are available.

None

Applies no calculation to the channel, that is, turns the effect off. The Operand slider has no effect.

Set

Specifies a preset value for all pixels in the channel. The Operand slider specifies which value is used.

Add

Increases the channel levels by adding the level set by the Operand slider to the current level of pixels in the channel. When used in Alpha Arithmetic, the overall effect makes the footage more opaque.

Subtract

Decreases the channel levels by subtracting the level set by the Operand slider from the current level of pixels in the channel. When used in Alpha Arithmetic, it makes the overall effect more transparent.

Multiply

Takes the value of pixels in the channel and multiplies it by the value specified by the Operand slider.

Difference

Uses the value of pixels in the channel and the value set by the Operand slider and calculates the difference between them.

Min

Compares the value of pixels in the channel to the value of the Operand slider. If a pixel has the lower value, it is unchanged; if it has a higher value, it is changed to the value of the Operand slider.

Max

Compares the value of pixels in the channel to the value of the Operand slider. If a pixel has the higher value, it is unchanged; if it has a lower value, it is changed to the value of the Operand slider.

AND

Applies a bit-wise logical AND operation between the value of the Operand slider and the channel.

OR

Applies a bit-wise logical OR operation between the value of the Operand slider and the channel.

XOR

Applies a bit-wise logical XOR operation between the value of the Operand slider and the channel.

Threshold

Converts channel pixels to either fully on or fully off. The Operand slider determines the threshold value: channel pixels below the Operand slider setting are turned fully off, while pixels with values above the Operand slider setting are turned fully on.

Screen

Multiplies the inverse of the Operand slider setting with pixels in the channel. The new pixel is always lighter than the existing one.