1 UIImage, CGImage, CIImage의 차이점

1.1 UIImage

1.2 CGImage

1.3 CIImage

2 이미지 클래스별 변환 코드

2.1 UIImage -> CGImage

let cgImage = uiImage.CGImage
//UIImageからCGImageへの変換時に方向パラメータを喪失する。
//画像の向きがおかしくなるためUIImage.imageOrientationを保持しておかなければならない
//https://qiita.com/YutoMizutani/items/de6c0f2200bdbab10624

2.2 CGImage -> UIImage

let uiImage = UIImage(CGImage: cgImage)

2.3 UIImage -> CIImage

let ciImage = uiimage.CIImage

2.4 CIImage -> UIImage

let uiImage = UIImage(CIImage: cgImage)

2.5 CGImage -> CIImage

let ciImage = CIImage(CGImage: cgImage)

2.6 CIImage -> CGImage

let context = CIContext(options: nil)
let cgImage = context.createCGImage(ciImage, fromRect: ciImage.extent())

3 로컬 파일의 읽기와 쓰기

3.1 UIImage->URL

let pngImageData = UIImagePNGRepresentation(image) 
pngImageData!.write(to: URL(fileURLWithPath: path), options: .atomic)

3.2 URL->UIImage

let image = UIImage(contentsOfFile: path)

3.3 CGImage->URL

3.4 URL->CGImage

3.5 CIImage->URL

3.6 URL->CIImage

let ciimage = CIImage(contentsOf: url)

참고 문장