---
title: extent
framework: Core Image
role: symbol
role_heading: Instance Property
platforms: [iOS 9.0+, iPadOS 9.0+, Mac Catalyst 13.1+, macOS 10.4+, tvOS 9.0+, visionOS 1.0+]
path: coreimage/ciimageaccumulator/extent
---

# extent

The extent of the image associated with the image accumulator.

## Declaration

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

## Discussion

Discussion Extent is a rectangle that specifies the size of the image associated with the image accumulator. This rectangle is the size of the complete region of the working coordinate space, and is a fixed area. It specifies the x-value of the rectangle origin, the y-value of the rectangle origin, and the width and height.

## See Also

### Obtaining Data From an Image Accumulator

- [format](coreimage/ciimageaccumulator/format.md)
- [image()](coreimage/ciimageaccumulator/image().md)