# init(copying:cvImageFormat:cgImageFormat:pixelFormat:) Initializes a pixel buffer by copying the data from a Core Video pixel buffer. ``` init(copying cvPixelBuffer: CVPixelBuffer, cvImageFormat: vImageCVImageFormat, cgImageFormat: inout vImage_CGImageFormat, pixelFormat: Format.Type = Format.self) throws ``` ## Parameters `cvPixelBuffer` The source Core Video pixel buffer. `cvImageFormat` The image format of the Core Video pixel buffer. `cgImageFormat` The Core Graphics image format that specifies the image output. `pixelFormat` The pixel format of the initialized buffer. ## Discussion The following code shows how to incorporate a vImage pixel buffer into a instance. The code calls [`init(copying:cvImageFormat:cgImageFormat:pixelFormat:)`](/documentation/Accelerate/vImage/PixelBuffer/init(copying:cvImageFormat:cgImageFormat:pixelFormat:)) to initialize a pixel buffer from the processor kernel’s input. ```swift class ContrastStretchImageProcessorKernel: CIImageProcessorKernel { static var cgImageFormat = vImage_CGImageFormat( bitsPerComponent: 8, bitsPerPixel: 32, colorSpace: CGColorSpaceCreateDeviceRGB(), bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.noneSkipLast.rawValue), renderingIntent: .defaultIntent)! static let cvImageFormat = vImageCVImageFormat.make( format: .format32BGRA, colorSpace: CGColorSpaceCreateDeviceRGB(), alphaIsOpaqueHint: true)! override class var outputFormat: CIFormat { return CIFormat.BGRA8 } override class func formatForInput(at input: Int32) -> CIFormat { return CIFormat.BGRA8 } override class func process(with inputs: [CIImageProcessorInput]?, arguments: [String: Any]?, output: CIImageProcessorOutput) throws { guard let input = inputs?.first, let inputPixelBuffer = input.pixelBuffer, let outputPixelBuffer = output.pixelBuffer else { return } let buffer = try vImage.PixelBuffer(copying: inputPixelBuffer, cvImageFormat: cvImageFormat, cgImageFormat: &cgImageFormat, pixelFormat: vImage.Interleaved8x4.self) buffer.contrastStretch(destination: buffer) try buffer.copy(to: outputPixelBuffer, cvImageFormat: cvImageFormat, cgImageFormat: cgImageFormat) } } ``` ## See Also [`func vImageBuffer_InitWithCVPixelBuffer(UnsafeMutablePointer, UnsafeMutablePointer, CVPixelBuffer, vImageCVImageFormat!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageBuffer_InitWithCVPixelBuffer(_:_:_:_:_:_:)) Initializes a vImage buffer with a copy of the contents of a Core Video pixel buffer. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)