---
title: roiTileIndex
framework: coreimage
role: symbol
role_heading: Instance Property
path: coreimage/ciimageprocessorinput/roitileindex
---

# roiTileIndex

This property tells a tiled-input processor which input tile index is being processed.

## Declaration

```swift
var roiTileIndex: Int { get }
```

## Discussion

Discussion This property is only relevant if your processor implements /CIImageProcessorKernel/roiTileArrayForInput:arguments:outputRect: This can be useful if the processor needs to clear the CIImageProcessorOutput before the first tile is processed.

## See Also

### Instance Properties

- [digest](coreimage/ciimageprocessorinput/digest.md)
- [roiTileCount](coreimage/ciimageprocessorinput/roitilecount.md)