The Calculations effect combines channels of one layer with the channels of a second layer.

This effect works with 8-bpc and 16-bpc color.

Input Channel

The channel to extract and use as input to the blending operation. RGBA displays all channels normally. Gray converts all color channel values for a pixel to the luminance value of the original pixel. Red, Green, or Blue converts all color channel values for a pixel to the value of the selected color channel for the original pixel. Alpha converts all channels to the value of the alpha channel for the original pixel.

Invert Input

Inverts the layer (subtracts each channel value from 1.0) before the effect extracts the specified channel information.

Second Layer

The control layer with which Calculations blends the original layer.

Second Layer Channel

The channel to be blended with the input channels.

Second Layer Opacity

The opacity of the second layer. Use a setting of 0% for the second layer to have no influence on the output.

Invert Second Layer

Inverts the second layer (subtracts each channel value from 1.0) before the effect extracts the specified channel information.

Stretch Second Layer To Fit

Stretches the second layer to the dimensions of the original layer before blending. Deselect to center the second layer on the original layer.

Preserve Transparency

Ensures that the original layer’s alpha channel isn’t modified.