画像フィルター

imageFilter.swift

    // filterの一覧はCore Image Filter Referenceにあり。
    func sepiaFilter(image:UIImage) -> UIImage?
    {
        
        let ciImage = CIImage(image: image)
        let filter = CIFilter(name: "CISepiaTone")
        filter.setValue(ciImage, forKey: kCIInputImageKey)
        filter.setValue(0.8, forKey: "inputIntensity")
        let ciContext = CIContext(options: nil)
        let cgimg = ciContext.createCGImage(filter.outputImage, fromRect: filter.outputImage.extent())
        
        let resImage = UIImage(CGImage: cgimg, scale: 1.0, orientation: UIImageOrientation.Up)
        
        return resImage
    }