The Calculations effect combines the channels of one clip with the channels of another clip.

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Original images (left and center), and with effect applied (right)

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 clip before the effect extracts the specified channel information.

Second Layer

The video track with which Calculations blends the original clip.

Second Layer Channel

The channel to be blended with the input channels.

Second Layer Opacity

The opacity of the second video track. Set to 0% for the second video track to have no influence on the output.

Invert Second Layer

Inverts the second video track before the effect extracts the specified channel information.

Stretch Second Layer To Fit

Stretches the second video track to the dimensions of the original clip before blending. Deselect this option to center the second video track on the original clip.

Preserve Transparency

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