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  "identifier" : "/documentation/CoreImage/CIFilter-swift.class/linearBurnBlendMode()",
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  "title" : "linearBurnBlendMode()"
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# linearBurnBlendMode()

Blends color from two images while increasing contrast.

```
class func linearBurnBlendMode() -> any CIFilter & CICompositeOperation
```

## Return Value

The modified image.

## Discussion

This method applies the linear-burn blend mode filter to an image. The effect calculates the brightness value for the background image then darkens it to reflect the brightness of the input image. The effect then decreases the contrast in the output image.

The linear-burn blend mode filter uses the following properties:

- `inputImage`: An image with the type [`CIImage`](/documentation/CoreImage/CIImage).
- `backgroundImage`: An image with the type [`CIImage`](/documentation/CoreImage/CIImage).

The following code creates a filter that results in an output image that’s much darker with very little visible detail:

```swift
func linearBurnBlendMode(inputImage: CIImage, backgroundImage: CIImage) -> CIImage {
    let colorBlendFilter = CIFilter.linearBurnBlendMode()
    colorBlendFilter.inputImage = inputImage
    colorBlendFilter.backgroundImage = backgroundImage
    return colorBlendFilter.outputImage!
}
```

![The image on the top left shows a beach with multiple palm trees and a rainbow arching across the blue sky.  The image below is a gradient image displaying a gradual color shift from purple to a dark orange. The image on the right shows the output from applying a linear burn blend mode filter. The result displays the beach rainbow image with very little detail and brightness.](images/com.apple.coreimage/media-3546415@2x.png)

---

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