DDGScreenShot — image with Gaussian blur, old movie effect

write in front

有了简单的图片滤镜基础，接下来就可以做一些难一点操作，图片合成老电影的特效

specific code

//这个是高斯模糊的代码，比较的简单
func gaussianBlurFilmEffect() {
        filter = CIFilter(name: "CIGaussianBlur")
        filter.setValue(10.0, forKey: "inputRadius")
        let inputImage = CIImage(image: originalImage)
        filter.setValue(inputImage, forKey: kCIInputImageKey)
        let outputImage =  filter.outputImage!
        let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
        self.imageView.image = UIImage(cgImage: cgImage!)

    }
    

    

This is the process of synthesizing old movies)

There are some shielded codes in the middle for output verification, check the current output

func oldFilmEffect(){
        let inputImage = CIImage(image: originalImage)!
        // 1.创建CISepiaTone滤镜（棕绿色）
        let sepiaToneFilter = CIFilter(name: "CISepiaTone")!
        sepiaToneFilter.setValue(inputImage, forKey: kCIInputImageKey)
        //参数是强度
        sepiaToneFilter.setValue(1, forKey: kCIInputIntensityKey)
//        let outputImage = sepiaToneFilter.outputImage!
//        let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
//        imageView.image = UIImage(cgImage: cgImage!)
        // 2.创建白班图滤镜
        let whiteSpecksFilter = CIFilter(name: "CIColorMatrix")!
        whiteSpecksFilter.setValue(CIFilter(name: "CIRandomGenerator")!.outputImage!.cropped(to: inputImage.extent), forKey: kCIInputImageKey)
        whiteSpecksFilter.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputRVector")
        whiteSpecksFilter.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputGVector")
        whiteSpecksFilter.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputBVector")
        whiteSpecksFilter.setValue(CIVector(x: 0, y: 0, z: 0, w: 0), forKey: "inputBiasVector")
//        let outputImage = whiteSpecksFilter.outputImage!
//        let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
//        imageView.image = UIImage(cgImage: cgImage!)
        // 3.把CISepiaTone滤镜和白班图滤镜以源覆盖(source over)的方式先组合起来
        let sourceOverCompositingFilter = CIFilter(name: "CISourceOverCompositing")!
        sourceOverCompositingFilter.setValue(whiteSpecksFilter.outputImage, forKey: kCIInputBackgroundImageKey)
        sourceOverCompositingFilter.setValue(sepiaToneFilter.outputImage, forKey: kCIInputImageKey)
        // 4.用CIAffineTransform滤镜先对随机噪点图进行处理 应用坐标系
        let affineTransformFilter = CIFilter(name: "CIAffineTransform")!
        affineTransformFilter.setValue(CIFilter(name: "CIRandomGenerator")!.outputImage!.cropped(to: inputImage.extent), forKey: kCIInputImageKey)
        affineTransformFilter.setValue(NSValue(cgAffineTransform: CGAffineTransform(scaleX: 1.5, y: 25)), forKey: kCIInputTransformKey)
//        let outputImage = affineTransformFilter.outputImage!
//        let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
//        imageView.image = UIImage(cgImage: cgImage!)
        // 5.创建蓝绿色磨砂图滤镜
        let darkScratchesFilter = CIFilter(name: "CIColorMatrix")!
        darkScratchesFilter.setValue(affineTransformFilter.outputImage, forKey: kCIInputImageKey)
        darkScratchesFilter.setValue(CIVector(x: 4, y: 0, z: 0, w: 0), forKey: "inputRVector")
        darkScratchesFilter.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputGVector")
        darkScratchesFilter.setValue(CIVector(x: 0, y: 0, z: 0, w: 0), forKey: "inputBVector")
       darkScratchesFilter.setValue(CIVector(x: 0, y: 0, z: 0, w: 0), forKey: "inputAVector")
        darkScratchesFilter.setValue(CIVector(x: 0, y: 1, z: 1, w: 1), forKey: "inputBiasVector")
        // 6.用CIMinimumComponent滤镜把蓝绿色磨砂图滤镜处理成黑色磨砂图滤镜
        let minimumComponentFilter = CIFilter(name: "CIMinimumComponent")!
        minimumComponentFilter.setValue(darkScratchesFilter.outputImage, forKey: kCIInputImageKey)
        // 7.最终组合在一起
        let multiplyCompositingFilter = CIFilter(name: "CIMultiplyCompositing")!
        multiplyCompositingFilter.setValue(minimumComponentFilter.outputImage, forKey: kCIInputBackgroundImageKey)
        multiplyCompositingFilter.setValue(sourceOverCompositingFilter.outputImage, forKey: kCIInputImageKey)
        // 8.最后输出
        let outputImage = multiplyCompositingFilter.outputImage!
        let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
        imageView.image = UIImage(cgImage: cgImage!)
        
    }

concluding remarks

看完这一节，对高斯模糊，老电影高级用法有了更深的认识，希望能够帮助到你。
此代码已经上传到githup[DDGScreenShot](https://github.com/dudongge/DDGScreenShot)
[link](https://github.com/dudongge/DDGScreenShot)
当然这只是这个库的功能的一小部分
想看更多功能，可以去github上下载，如果对您有帮助，希望您不吝给个star.

Welcome to DDGScreenShot

The rest of the functions are as follows

1. (1) DDGScreenShot - complex screenshots (such as view ScrollView webView wkwebView)
2. (2) DDGScreenShot--iOS image processing--multiple image stitching
3. (3) DDGScreenShot--iOS image cropping, cutting rounded corners, adding borders, you also use cornerRadius, and more advanced usage
4. (4) DDGScreenShot—picture erasing function
5. (5) DDGScreenShot—capture any part of the picture
6. (6) DDGScreenShot — pictures with various filters and high-quality operations