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  "title" : "Image Buffer Pixel Aspect Ratio Keys"
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# Image Buffer Pixel Aspect Ratio Keys

Keys that describe the pixel aspect ratio of an image buffer.

## Discussion

Define these key-value pairs in a <doc://com.apple.documentation/documentation/CoreFoundation/CFDictionary> instance and use the [`kCVImageBufferPixelAspectRatioKey`](/documentation/CoreVideo/kCVImageBufferPixelAspectRatioKey) key to attach it to the image buffer.

## Topics

### Constants

[`let kCVImageBufferPixelAspectRatioHorizontalSpacingKey: CFString`](/documentation/CoreVideo/kCVImageBufferPixelAspectRatioHorizontalSpacingKey)

A key to the horizontal component of the image buffer aspect ratio.

[`let kCVImageBufferPixelAspectRatioVerticalSpacingKey: CFString`](/documentation/CoreVideo/kCVImageBufferPixelAspectRatioVerticalSpacingKey)

A key to the vertical component of the image buffer aspect ratio.


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