---
title: Image Buffer Chroma Location Constants
framework: corevideo
role: collectionGroup
role_heading: API Collection
path: corevideo/image-buffer-chroma-location-constants
---

# Image Buffer Chroma Location Constants

Constants that indicate locations for chroma samples in the image buffer.

## Overview

Overview For progressive-scan image data, use the kCVImageBufferChromaLocationTopFieldKey key to attach one of these values to the image buffer. For interlaced image data, attach values to the image buffer using the kCVImageBufferChromaLocationTopFieldKey and kCVImageBufferChromaLocationBottomFieldKey keys.

## Topics

### Constants

- [kCVImageBufferChromaLocation_Left](corevideo/kcvimagebufferchromalocation_left.md)
- [kCVImageBufferChromaLocation_Center](corevideo/kcvimagebufferchromalocation_center.md)
- [kCVImageBufferChromaLocation_TopLeft](corevideo/kcvimagebufferchromalocation_topleft.md)
- [kCVImageBufferChromaLocation_Top](corevideo/kcvimagebufferchromalocation_top.md)
- [kCVImageBufferChromaLocation_BottomLeft](corevideo/kcvimagebufferchromalocation_bottomleft.md)
- [kCVImageBufferChromaLocation_Bottom](corevideo/kcvimagebufferchromalocation_bottom.md)
- [kCVImageBufferChromaLocation_DV420](corevideo/kcvimagebufferchromalocation_dv420.md)

## See Also

### Constants

- [Image Buffer Attachment Keys](corevideo/image-buffer-attachment-keys.md)
- [Image Buffer Clean Aperture Keys](corevideo/image-buffer-clean-aperture-keys.md)
- [Image Buffer Pixel Aspect Ratio Keys](corevideo/image-buffer-pixel-aspect-ratio-keys.md)
- [Image Buffer Display Dimensions Keys](corevideo/image-buffer-display-dimensions-keys.md)
- [Image Buffer Field Detail Constants](corevideo/image-buffer-field-detail-constants.md)
- [Image Buffer YCbCr Matrix Constants](corevideo/image-buffer-ycbcr-matrix-constants.md)
- [Image Buffer Color Primaries Constants](corevideo/image-buffer-color-primaries-constants.md)
- [Image Buffer Transfer Function Constants](corevideo/image-buffer-transfer-function-constants.md)
- [Image Buffer Chroma Subsampling Constants](corevideo/image-buffer-chroma-subsampling-constants.md)
- [Image Buffer Display Mask Rectangle Keys](corevideo/image-buffer-display-mask-rectangle-keys.md)
- [kCVImageBufferDisplayMaskRectangleKey](corevideo/kcvimagebufferdisplaymaskrectanglekey.md)
- [kCVImageBufferDisplayMaskRectangleStereoLeftKey](corevideo/kcvimagebufferdisplaymaskrectanglestereoleftkey.md)
- [kCVImageBufferDisplayMaskRectangleStereoRightKey](corevideo/kcvimagebufferdisplaymaskrectanglestereorightkey.md)