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# QCCompositionProtocolImageFilter

A  composition that  applies an effect to a source image.  A conforming composition must use the input key [`QCCompositionInputImageKey`](/documentation/Quartz/QCCompositionInputImageKey) for the source image and [`QCCompositionOutputImageKey`](/documentation/Quartz/QCCompositionOutputImageKey) for the output image. The composition can optionally use [`QCCompositionInputXKey`](/documentation/Quartz/QCCompositionInputXKey) to specify the X position of the center point of the effect, [`QCCompositionInputYKey`](/documentation/Quartz/QCCompositionInputYKey) to specify the Y position of the center point of the effect, and[`QCCompositionInputPreviewModeKey`](/documentation/Quartz/QCCompositionInputPreviewModeKey) to indicate if the animation should run in lower-quality for preview purposes.

```
let QCCompositionProtocolImageFilter: String
```

---

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