Calculations

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

calculations-secondlayer — Original Image 2 – From Unsplash.com

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.

calculations-rgba50-overlay-invert1-2 — Channels: RGBA, Second Layer Opacity: 50%, Blend Mode: Overlay, Invert Second Layer: Yes

calculations-rgba50-overlay-invert1 — Channels: RGBA, Second Layer Opacity: 50%, Blend Mode: Overlay, Invert First Layer: Yes, Invert Second Layer: No

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 alpha channel of the original layer isn’t modified.

Blending Mode: The method that is used to blend the two images together.