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# vImageCVImageFormat_Create(_:_:_:_:_:)

Creates the description of image encoding in a Core Video pixel buffer from the specified properties.

```
func vImageCVImageFormat_Create(_ imageFormatType: UInt32, _ matrix: UnsafePointer<vImage_ARGBToYpCbCrMatrix>!, _ cvImageBufferChromaLocation: CFString!, _ baseColorspace: CGColorSpace!, _ alphaIsOneHint: Int32) -> Unmanaged<vImageCVImageFormat>!
```

## Parameters

`imageFormatType`

The format type of the image. See <doc://com.apple.documentation/documentation/CoreVideo/pixel-format-identifiers>.

`matrix`

A [`vImage_ARGBToYpCbCrMatrix`](/documentation/Accelerate/vImage_ARGBToYpCbCrMatrix) that describes the conversion from RGB to the YpCbCr format.

`cvImageBufferChromaLocation`

The chrominance location.

`baseColorspace`

The color space of RGB and monochrome images. For YpCbCr images, this is the color space of the RGB image before conversion to YpCbCr using the ARGB-to-YpCbCr conversion matrix. The YpCbCr format RGB primaries and transfer function define the color space.

`alphaIsOneHint`

A hint that indicates that the function interprets an image with an alpha channel as opaque.

## Return Value

A [`vImageCVImageFormat`](/documentation/Accelerate/vImageCVImageFormat) instance encoded with the function’s parameters.

## Discussion

This function derives values that parameters from the image format type don’t specify, such as the number of channels, channel names, and channel descriptions.

## See Also

[`make(format:matrix:chromaSiting:colorSpace:alphaIsOpaqueHint:)`](/documentation/Accelerate/vImageCVImageFormat/make(format:matrix:chromaSiting:colorSpace:alphaIsOpaqueHint:))

Creates the description of image encoding in a Core Video pixel buffer from the specified properties.


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