<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.15.0 -",
    "tvOS: 13.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreImage",
  "identifier" : "/documentation/CoreImage/CIFilter-swift.class/linearDodgeBlendMode()",
  "metadataVersion" : "0.1.0",
  "role" : "Type Method",
  "symbol" : {
    "kind" : "Type Method",
    "modules" : [
      "Core Image",
      "CoreImage"
    ],
    "preciseIdentifier" : "c:objc(cs)CIFilter(cm)linearDodgeBlendModeFilter"
  },
  "title" : "linearDodgeBlendMode()"
}
-->

# linearDodgeBlendMode()

Blends colors of two images with dodging.

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

## Return Value

The modified image.

## Discussion

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

The linear-dodge-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 the image becoming brighter with both images’ colors:

```swift
func linearDodgeBlendMode(inputImage: CIImage, backgroundImage: CIImage) -> CIImage {
    let colorBlendFilter = CIFilter.linearDodgeBlendMode()
    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 dodge blend mode filter. The result displays colors from both images, creating a brighter image.](images/com.apple.coreimage/media-3546417@2x.png)

---

Copyright &copy; 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)