---
title: kCIInputBacksideImageKey
framework: coreimage
role: symbol
role_heading: Global Variable
path: coreimage/kciinputbacksideimagekey
---

# kCIInputBacksideImageKey

A key to get or set the backside image for a transition Core Image filter.

## Declaration

```swift
let kCIInputBacksideImageKey: String
```

## Discussion

Discussion The value for this key needs to be a CIImage instance.

## See Also

### Constants

- [constrainedHigh](coreimage/cidynamicrangeoption/constrainedhigh.md)
- [high](coreimage/cidynamicrangeoption/high.md)
- [standard](coreimage/cidynamicrangeoption/standard.md)
- [kCIInputAmountKey](coreimage/kciinputamountkey.md)
- [kCIInputAngleKey](coreimage/kciinputanglekey.md)
- [kCIInputAspectRatioKey](coreimage/kciinputaspectratiokey.md)
- [kCIInputBackgroundImageKey](coreimage/kciinputbackgroundimagekey.md)
- [kCIInputBiasVectorKey](coreimage/kciinputbiasvectorkey.md)
- [kCIInputBrightnessKey](coreimage/kciinputbrightnesskey.md)
- [kCIInputCenterKey](coreimage/kciinputcenterkey.md)
- [kCIInputColorKey](coreimage/kciinputcolorkey.md)
- [kCIInputColor0Key](coreimage/kciinputcolor0key.md)
- [kCIInputColor1Key](coreimage/kciinputcolor1key.md)
- [kCIInputColorSpaceKey](coreimage/kciinputcolorspacekey.md)
- [kCIInputContrastKey](coreimage/kciinputcontrastkey.md)