---
title: kCVImageBufferPreferredCleanApertureKey
framework: corevideo
role: symbol
role_heading: Global Variable
path: corevideo/kcvimagebufferpreferredcleanaperturekey
---

# kCVImageBufferPreferredCleanApertureKey

A key to the dictionary describing the preferred clean aperture for the image buffer.

## Declaration

```swift
let kCVImageBufferPreferredCleanApertureKey: CFString
```

## Discussion

Discussion The dictionary is of type CFDictionary. See Image Buffer Clean Aperture Keys for more information.

## See Also

### Constants

- [kCVImageBufferCGColorSpaceKey](corevideo/kcvimagebuffercgcolorspacekey.md)
- [kCVImageBufferCleanApertureKey](corevideo/kcvimagebuffercleanaperturekey.md)
- [kCVImageBufferFieldCountKey](corevideo/kcvimagebufferfieldcountkey.md)
- [kCVImageBufferFieldDetailKey](corevideo/kcvimagebufferfielddetailkey.md)
- [kCVImageBufferPixelAspectRatioKey](corevideo/kcvimagebufferpixelaspectratiokey.md)
- [kCVImageBufferDisplayDimensionsKey](corevideo/kcvimagebufferdisplaydimensionskey.md)
- [kCVImageBufferGammaLevelKey](corevideo/kcvimagebuffergammalevelkey.md)
- [kCVImageBufferICCProfileKey](corevideo/kcvimagebuffericcprofilekey.md)
- [kCVImageBufferYCbCrMatrixKey](corevideo/kcvimagebufferycbcrmatrixkey.md)
- [kCVImageBufferColorPrimariesKey](corevideo/kcvimagebuffercolorprimarieskey.md)
- [kCVImageBufferTransferFunctionKey](corevideo/kcvimagebuffertransferfunctionkey.md)
- [kCVImageBufferChromaLocationTopFieldKey](corevideo/kcvimagebufferchromalocationtopfieldkey.md)
- [kCVImageBufferChromaLocationBottomFieldKey](corevideo/kcvimagebufferchromalocationbottomfieldkey.md)
- [kCVImageBufferChromaSubsamplingKey](corevideo/kcvimagebufferchromasubsamplingkey.md)
- [kCVImageBufferAlphaChannelIsOpaque](corevideo/kcvimagebufferalphachannelisopaque.md)