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# vImageCVImageFormat_SetChromaSiting(_:_:)

Sets the chrominance siting of a Core Video image format.

```
func vImageCVImageFormat_SetChromaSiting(_ format: vImageCVImageFormat, _ siting: CFString!) -> vImage_Error
```

## Parameters

`format`

The Core Video image format to update.

`siting`

The new siting information for the format.

## Return Value

[`kvImageNoError`](/documentation/Accelerate/kvImageNoError); otherwise, one of the error codes in <doc://com.apple.documentation/documentation/Accelerate/data-types-and-constants>.

## Discussion

4:2:0 and 4:2:0 YpCbCr image formats that have subsampled chrominance require the position of the chrominance samples relative to the luminance samples.

## See Also

[`chromaSiting`](/documentation/Accelerate/vImageCVImageFormat/chromaSiting-swift.property)

The chrominance siting of the Core Video image format.


---

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