无法使用 UISlider 降低 CIVignette 效果

Question

我为“我的照片编辑”应用程序使用了 CIVignette 效果。它基于 Slider 的 Changing 事件应用。我使用了以下代码，我的问题是每当我增加滑块的值时就会出现晕影效果，但每当我减少滑块的值时晕影效果就不会减少。
请帮助。

@IBAction func slider(_ sender: UISlider) {

        let startImage = CIImage(image: imgEdited!)!

        let vignetteFilter = CIFilter(name: "CIVignette")!

        let radius = 5

        vignetteFilter.setValue(startImage, forKey:kCIInputImageKey)
        vignetteFilter.setValue(sender.value, forKey:"inputIntensity")
        vignetteFilter.setValue(radius, forKey:"inputRadius")

        let filteredImageData = vignetteFilter.value(forKey: kCIOutputImageKey) as! CIImage
        let filteredImageRef = self.context.createCGImage(filteredImageData, from: filteredImageData.extent)

        imgImage.image = UIImage.init(cgImage: filteredImageRef!)
        self.imgEdited = imgImage.image
}

Answer 1

下面的代码基于我对其他 SO post .

的回答

 @IBAction func slider(_ sender: UISlider) {

    let startImage = CIImage(image: UIImage(named: "Your Image Name")!) // You should initialise your UIImage here not UIImageView
    let vignetteFilter = CIFilter(name: "CIVignette")! 

    vignetteFilter.setValue(startImage, forKey:kCIInputImageKey)
    vignetteFilter.setValue(sender.value, forKey:kCIInputIntensityKey)
    vignetteFilter.setValue(5, forKey:kCIInputRadiusKey)

    let filteredImageData = vignetteFilter.value(forKey: kCIOutputImageKey) as! CIImage
    let filteredImageRef = self.context.createCGImage(filteredImageData, from: filteredImageData.extent)

    self.imgView.image = UIImage.init(cgImage: filteredImageRef!) // Output

 }

Sim 的输出：

无法使用 UISlider 降低 CIVignette 效果

Unable to Decrease CIVignette effect using UISlider

ios

swift3

core-image

cifilter