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# vImage.BlendMode.lighten

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

```
case lighten
```

## Discussion

The following image shows the result of compositing using the lighten blend mode:

![Graphic showing the lighten blend mode composite operation.](images/com.apple.accelerate/media-3958276@2x.png)

The top-left quadrant in the result is white because no pixels in the bottom layer are brighter than the corresponding pixels in the top layer.

The bottom-left quadrant in the result looks washed out because the operation selects gray pixels from the top layer over corresponding dark pixels from the bottom layer.

## See Also

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


---

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