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# kCVImageBufferChromaLocationTopFieldKey

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

```
let kCVImageBufferChromaLocationTopFieldKey: CFString
```

## Discussion

The chroma location value is of type <doc://com.apple.documentation/documentation/CoreFoundation/CFString>. This key only applies to progressive-scan image data. See [Image Buffer Chroma Location Constants](/documentation/CoreVideo/image-buffer-chroma-location-constants) for more information.

---

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