Swift: Convert between CGImage, CIImage and UIImage

Swift에서 이미지 종류별로 변환하는 방법이 명쾌하게 설명된 사이트를 찾아서 여기에 기록한다.

출처: http://wiki.hawkguide.com/wiki/Swift:_Convert_between_CGImage,_CIImage_and_UIImage

사실 나는 이 자료를 UIImage를 CGImage로 변환하기 위해서 찾아왔는데 변환 방법이 간단하지 않아서 놀랐다.

Swift: Convert CIImage to CGImage

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func convertCIImageToCGImage(inputImage: CIImage) -> CGImage! {     let context = CIContext(options: nil)     if context != nil {         return context.createCGImage(inputImage, fromRect: inputImage.extent())     }     return nil }

Swift: Convert CGImage to CIImage

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func convertCGImageToCIImage(inputImage: CGImage) -> CIImage! {    var ciImage = CIImage(CGImage: inputImage)     return ciImage }

Swift: Convert CGImage or CIImage to UIImage

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1 2	UIImage(CGImage: cgImage) UIImage(CIImage: ciImage)

Swift: Convert UIImage to CIImage

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//uiImage: UIImage //Convert to CIImage var ciImage = CIImage(image: uiImage)

Swift: Convert UIImage to CGImage

To convert to CGImage, it requires 2 steps:

First convert to CIImage #Swift: Convert UIImage to CIImage.

Then convert to CGImage #Swift:_Convert_CIImage_to_CGImage

Swift: Convert CGImage to UIImage

UIImage.init(CGImage: cgimage)를 사용하면 된다.