# Overlay A blend operation that multiplies dark areas and screens light areas. ## Overview 2 * F * B if F < 0.5; 1 - (1 - F)(1 - B) if F >= 0.5 ## Parameter Types **Overlay (float):** |Input |Type | |------------|-----| |`Foreground`|Float| |`Background`|Float| |`Mix` |Float| |Output|Type | |------|-----| |`Out` |Float| **Overlay (color4f):** |Input |Type | |------------|-------------| |`Foreground`|Color4| |`Background`|Color4| |`Mix` |Float | |Output|Type | |------|-------------| |`Out` |Color4| **Overlay (color3f):** |Input |Type | |------------|-------------| |`Foreground`|Color3| |`Background`|Color3| |`Mix` |Float | |Output|Type | |------|-------------| |`Out` |Color3| **Overlay (half):** |Input |Type| |------------|----| |`Foreground`|Half| |`Background`|Half| |`Mix` |Half| |Output|Type| |------|----| |`Out` |Half| ## Parameter descriptions - `Foreground`: The foreground input. Represented by `F` in the mathmatical equation. - `Background`: The background input. Represented by `B` in the mathmatical equation. - `Mix`: The weight of the blend operation. The higher the value of `Mix`, the more apparent the effect of the blend operation. The default value is `1`. Values outside of the range `0-1` produce an undefined effect outside of the node’s intended function. ## Discussion The `Overlay` node has one of two effects: - If `F+B` is less than `0.5`, then the node outputs a value of `2*F*B`. - If `F+B` is greater than or equal to `0.5`, then it outputs`1-(1-F)(1-B)`, which creates the same visual effect as the [`Screen`](/documentation/ShaderGraph/Compositing/Screen) node. Visually the node makes dark areas of the blended texture even darker and light areas of the blended texture even lighter. Below is an example of a simple node graph that uses the `Overlay` node to blend two images together into a single material:  Below are two images and their resulting blended texture applied to a cube:    --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)