如何通过带有 Swift 的 UISlider 使用 CIColorControls 更改亮度、对比度和饱和度

Question

我正在开发一个照片滤镜应用程序，如您所见，我添加了一项功能来调整对比度、亮度、饱和度和噪点。但问题是它们独立工作，这意味着当我开始编辑对比度时，我正在调整亮度，它 returns 到原始亮度。

这是我将亮度调到最大（图像变白）然后尝试调整其对比度并且滑块改变了原始图像的对比度时的预览。

在这里我能够捕捉到释放滑块并将其值放在原始图像上的时刻，正如你所看到的那样，在演示中我将饱和度设置为 0，然后将相同饱和度的对比度更改为0 张图片。

。

问题是，现在当我只单击滑块而不更改其值时，它会将当前值加倍。例如，如果我将亮度设置为 5，将饱和度设置为 10，并决定在单击亮度后立即调整亮度，它的值会加倍，我不知道为什么。这是一个例子。我只是点击滑块而不改变它的值。

这是代码

  @objc func sliderValueDidChange(_ sender: UISlider!) {

    if sender.tag == 0 {

        let displayinPercentage: Int = Int((sender.value/200) * 10000)
        brightnessValueLabel.text = ("\(displayinPercentage)")
        selectedPictureImageView.image = originalImage
        let beginImage = CIImage(image: selectedPictureImageView.image!)
        self.filter = CIFilter(name: "CIColorControls")
        self.filter?.setValue(beginImage, forKey: kCIInputImageKey)
        self.filter.setValue(sender.value, forKey: kCIInputBrightnessKey)
        self.filteredImage = self.filter?.outputImage
        selectedPictureImageView.image = UIImage(cgImage: self.context.createCGImage(self.filteredImage!, from: (self.filteredImage?.extent)!)!)
        sliderValue = sender.value


    } else if sender.tag == 1 {

        let displayinPercentage: Int = Int((sender.value/200) * 10000)
        contrastValueLabel.text = ("\(displayinPercentage)")
        self.selectedPictureImageView.image = originalImage
        let beginImage = CIImage(image: self.selectedPictureImageView.image!)
        self.filter = CIFilter(name: "CIColorControls")
        self.filter?.setValue(beginImage, forKey: kCIInputImageKey)
        self.filter.setValue(sender.value, forKey: kCIInputContrastKey)
        self.filteredImage = self.filter?.outputImage
        self.selectedPictureImageView.image = UIImage(cgImage: self.context.createCGImage(self.filteredImage!, from: (self.filteredImage?.extent)!)!)
        sliderValue = sender.value

    } else if sender.tag == 2 {

        let displayinPercentage: Int = Int((sender.value/200) * 10000)
        saturationValueLabel.text = ("\(displayinPercentage)")
        self.selectedPictureImageView.image = originalImage
        let beginImage = CIImage(image: self.selectedPictureImageView.image!)
        self.filter = CIFilter(name: "CIColorControls")
        self.filter?.setValue(beginImage, forKey: kCIInputImageKey)
        self.filter.setValue(sender.value, forKey: kCIInputSaturationKey)
        self.filteredImage = self.filter?.outputImage
        self.selectedPictureImageView.image = UIImage(cgImage: self.context.createCGImage(self.filteredImage!, from: (self.filteredImage?.extent)!)!)
        sliderValue = sender.value

    } else if sender.tag == 3 {

        let displayinPercentage: Int = Int((sender.value/200) * 10000)
        sharpenValueLabel.text = ("\(displayinPercentage)")
        self.selectedPictureImageView.image = originalImage
        let beginImage = CIImage(image: self.selectedPictureImageView.image!)
        self.filter = CIFilter(name: "CIUnsharpMask")
        self.filter?.setValue(beginImage, forKey: kCIInputImageKey)
        self.filter.setValue(7, forKey: kCIInputRadiusKey)
        self.filter.setValue(sender.value, forKey: kCIInputIntensityKey)
        self.filteredImage = self.filter?.outputImage
        self.selectedPictureImageView.image = UIImage(cgImage: self.context.createCGImage(self.filteredImage!, from: (self.filteredImage?.extent)!)!)
        sliderValue = sender.value

    }
}

@objc func sliderValueDidEnd(_ sender: UISlider!) {

    if sender.tag == 0 {
        originalImage = selectedPictureImageView.image
        sender.value = sliderValue
        print("Unpressed button slider value is \(sender.value)")
    } else if sender.tag == 1 {
        originalImage = selectedPictureImageView.image
        sender.value = sliderValue
        print("Unpressed button slider value is \(sender.value)")
    } else if sender.tag == 2 {
        originalImage = selectedPictureImageView.image
        sender.value = sliderValue
        print("Unpressed button slider value is \(sender.value)")
    } else if sender.tag == 3 {
        originalImage = selectedPictureImageView.image
        sender.value = sliderValue
        print("Unpressed button slider value is \(sender.value)")
    }
}

我认为一切正常，我只是对过滤器值进行了错误的计算。

Answer 1

您的问题是，每次滑动滑块时，您都会将滤镜应用于前一个滤镜的结果图像，而不是将其应用于原始图像。顺便说一句，如果您在用户完成后创建一个 CGImage，则在滑动 UISlider 时可以使您的过滤器响应更快。您的代码应如下所示：

let displayinPercentage = Int((sender.value/200) * 10000)
brightnessValueLabel.text = String(displayinPercentage)
let beginImage = CIImage(image: originalImage)
filter.setValue(beginImage, forKey: kCIInputImageKey)
filter.setValue(sender.value, forKey: kCIInputBrightnessKey)
if let ciimage = filter.outputImage {
    filteredImage = ciimage
    selectedPictureImageView.image = UIImage(ciImage: filteredImage)
}

如何通过带有 Swift 的 UISlider 使用 CIColorControls 更改亮度、对比度和饱和度

How to change Brightness, Contrast and Saturation using CIColorControls via UISlider with Swift

ios

swift

core-graphics

core-image

cifilter