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# vImage.BlendMode

Constants that specify an alpha blending mode.

```
enum BlendMode
```

## Topics

### Enumeration Cases

[`case darken`](/documentation/Accelerate/vImage/BlendMode/darken)

Sets each channel of the destination pixel as the darkest value for the corresponding channel of the two source layers.

[`case lighten`](/documentation/Accelerate/vImage/BlendMode/lighten)

Sets each channel of the destination pixel as the lightest value for the corresponding channel of the two source layers

[`case multiply`](/documentation/Accelerate/vImage/BlendMode/multiply)

Sets the destination pixel as the product of the corresponding source pixels.

[`case screen`](/documentation/Accelerate/vImage/BlendMode/screen)

Sets the destination pixel as the inverted product of the inverted corresponding source pixels.

## See Also

  <doc://com.apple.accelerate/documentation/Accelerate/compositing-images-with-alpha-blending>

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

---

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