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# imageAccumulatorWithExtent:format:

Creates an image accumulator with the specified extent and pixel format.

```
+ (instancetype) imageAccumulatorWithExtent:(CGRect) extent format:(CIFormat) format;
```

## Parameters

`extent`

A rectangle that specifies the x-value of the rectangle origin, the y-value of the rectangle origin, and the width and height.

`format`

The format and size of each pixel. You must supply a pixel format constant, such as  kCIFormatARGB8  (32 bit-per-pixel, fixed-point pixel format) or kCIFormatRGBAf (128 bit-per-pixel, floating-point pixel format). See [`CIImage`](/documentation/CoreImage/CIImage) for more information about pixel format constants.

## Return Value

The image accumulator object.

## See Also

  [Core Image Programming Guide](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/CoreImaging/ci_intro/ci_intro.html#//apple_ref/doc/uid/TP30001185)

[`-  initWithExtent:format:`](/documentation/CoreImage/CIImageAccumulator/init(extent:format:))

Initializes an image accumulator with the specified extent and pixel format.


---

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