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

# region

The rectangular region of the input image that your Core Image Processor Kernel can use to provide the output.

## Declaration

```swift
var region: CGRect { get }
```

## Discussion

Discussion note: This will contain but may be larger than the rect returned by ‘roiCallback’.

## See Also

### Getting Supplemental Information for Image Processing

- [bytesPerRow](coreimage/ciimageprocessorinput/bytesperrow.md)
- [format](coreimage/ciimageprocessorinput/format.md)