---
title: Image Buffer Clean Aperture Keys
framework: corevideo
role: collectionGroup
role_heading: API Collection
path: corevideo/image-buffer-clean-aperture-keys
---

# Image Buffer Clean Aperture Keys

Keys that describe the clean aperture of an image buffer.

## Overview

Overview Define these key-value pairs in a CFDictionary instance and use the kCVImageBufferCleanApertureKey or kCVImageBufferPreferredCleanApertureKey key to attach it to the image buffer. An image’s clean aperture is a region of video that’s free from transition artifacts caused by the encoding of the signal. This is the region of video to display.

## Topics

### Constants

- [kCVImageBufferCleanApertureWidthKey](corevideo/kcvimagebuffercleanaperturewidthkey.md)
- [kCVImageBufferCleanApertureHeightKey](corevideo/kcvimagebuffercleanapertureheightkey.md)
- [kCVImageBufferCleanApertureHorizontalOffsetKey](corevideo/kcvimagebuffercleanaperturehorizontaloffsetkey.md)
- [kCVImageBufferCleanApertureVerticalOffsetKey](corevideo/kcvimagebuffercleanapertureverticaloffsetkey.md)

## See Also

### Constants

- [Image Buffer Attachment Keys](corevideo/image-buffer-attachment-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)