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

# Image Buffer Chroma Subsampling Constants

Constants that indicate the original format of subsampled data in the image buffer before conversion to 422/2vuy format.

## Overview

Overview Use the kCVImageBufferChromaSubsamplingKey key to attach one of these values to the image buffer. note: To use thse constants, ensure that the image buffer data was converted to 4:2:2 format using simple pixel replication.

## Topics

### Constants

- [kCVImageBufferChromaSubsampling_420](corevideo/kcvimagebufferchromasubsampling_420.md)
- [kCVImageBufferChromaSubsampling_422](corevideo/kcvimagebufferchromasubsampling_422.md)
- [kCVImageBufferChromaSubsampling_411](corevideo/kcvimagebufferchromasubsampling_411.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 Location Constants](corevideo/image-buffer-chroma-location-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)