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# maximumCompositing()

Applies a maximum compositing filter to an image.

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

## Return Value

The modified image.

## Discussion

This method applies the maximum compositing filter to an image. The effect calculates the maximum value for each color component in the input and background images. The filter then uses the resulting color to create the output image.

The maximum compositing 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 image with a mixture of images’ colors:

```swift
func maximumCompositing(inputImage: CIImage, backgroundImage: CIImage) -> CIImage {
    let colorBlendFilter = CIFilter.maximumCompositing()
    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 maximum compositing filter. The result displays a darker image with the colors from both images.](images/com.apple.coreimage/media-3546413@2x.png)

---

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