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  "framework" : "CoreImage",
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  "title" : "photoEffectMono()"
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# photoEffectMono()

Adjust an image’s colors to black and white.

```
class func photoEffectMono() -> any CIFilter & CIPhotoEffect
```

## Return Value

The modified image.

## Discussion

This method applies a preconfigured set of effects that imitate black-and-white photography film with low contrast.

The photo effect mono filter uses the following property:

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

The following code creates a filter that produces a black-and-white image:

```swift
func photoEffectMono(inputImage: CIImage ) -> CIImage {
    let photoEffect = CIFilter.photoEffectMono()
    photoEffect.inputImage = inputImage
    return photoEffect.outputImage!
}
```

![Two pictures of a pink flower surrounded by foliage. The photo on the left shows a single flower photographed close-up, in focus, with good light and no effects. In the photo on the right, a photo effect mono filter is applied, transforming the colors in the image to grayscale.](images/com.apple.coreimage/media-3545035@2x.png)

---

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