---
title: Image Buffer Attachment Keys
framework: corevideo
role: collectionGroup
role_heading: API Collection
path: corevideo/image-buffer-attachment-keys
---

# Image Buffer Attachment Keys

Keys that describe the attachment types associated with image buffers.

## Overview

Overview An image buffer associates its attachment keys in a CFDictionary instance. To read and write these image buffer attachments, use the CVBufferCopyAttachment(_:_:_:) and CVBufferSetAttachment(_:_:_:_:) functions or other CVBuffer functions. See the CVBuffer topic group for additional information.

## Topics

### 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)
- [kCVImageBufferChromaLocationBottomFieldKey](corevideo/kcvimagebufferchromalocationbottomfieldkey.md)
- [kCVImageBufferChromaSubsamplingKey](corevideo/kcvimagebufferchromasubsamplingkey.md)
- [kCVImageBufferAlphaChannelIsOpaque](corevideo/kcvimagebufferalphachannelisopaque.md)
- [kCVImageBufferContentLightLevelInfoKey](corevideo/kcvimagebuffercontentlightlevelinfokey.md)
- [kCVImageBufferMasteringDisplayColorVolumeKey](corevideo/kcvimagebuffermasteringdisplaycolorvolumekey.md)
- [kCVImageBufferPostDecodeProcessingFrameMetadataKey](corevideo/kcvimagebufferpostdecodeprocessingframemetadatakey.md)
- [kCVImageBufferPostDecodeProcessingSequenceMetadataKey](corevideo/kcvimagebufferpostdecodeprocessingsequencemetadatakey.md)
- [kCVImageBufferSceneIlluminationKey](corevideo/kcvimagebuffersceneilluminationkey.md)
- [kCVImageBufferHorizontalDisparityAdjustmentKey](corevideo/kcvimagebufferhorizontaldisparityadjustmentkey.md)

## See Also

### Constants

- [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 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)