---
title: kCVImageBufferChromaLocationBottomFieldKey
framework: corevideo
role: symbol
role_heading: Global Variable
path: corevideo/kcvimagebufferchromalocationbottomfieldkey
---

# kCVImageBufferChromaLocationBottomFieldKey

A key to the location of chroma bottom field information in the image buffer.

## Declaration

```swift
let kCVImageBufferChromaLocationBottomFieldKey: CFString
```

## Discussion

Discussion The chroma location value is of type CFString. This key only applies to interlaced image data. See Image Buffer Chroma Location Constants for more information.

## See Also

### Constants

- [kCVImageBufferCGColorSpaceKey](corevideo/kcvimagebuffercgcolorspacekey.md)
- [kCVImageBufferCleanApertureKey](corevideo/kcvimagebuffercleanaperturekey.md)
- [kCVImageBufferPreferredCleanApertureKey](corevideo/kcvimagebufferpreferredcleanaperturekey.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)
- [kCVImageBufferChromaSubsamplingKey](corevideo/kcvimagebufferchromasubsamplingkey.md)
- [kCVImageBufferAlphaChannelIsOpaque](corevideo/kcvimagebufferalphachannelisopaque.md)