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

# region

The rectangular region of the output image that your Core Image Processor Kernel must provide.

## Declaration

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

## Discussion

Discussion note: This may be different (larger or smaller) than the extent that was passed to /CIImageProcessorKernel/applyWithExtent:inputs:arguments:error:.

## See Also

### Getting Supplemental Information for Image Processing

- [metalCommandBuffer](coreimage/ciimageprocessoroutput/metalcommandbuffer.md)
- [bytesPerRow](coreimage/ciimageprocessoroutput/bytesperrow.md)
- [format](coreimage/ciimageprocessoroutput/format.md)