GPUImage(1) 高斯模糊 亮度调整

//高斯模糊
/*
let blurFilter = GPUImageGaussianBlurFilter()
blurFilter.blurRadiusInPixels = 10
var img = UIImage(named: "mark")
img = blurFilter.image(byFilteringImage: img)
let imgView = UIImageView()
imgView.frame = CGRect(x: 0, y: 200, width: 200, height: 200)
imgView.image = img
imgView.backgroundColor = UIColor.red
view.addSubview(imgView)
*/

//调整亮度
var img = UIImage(named: "mark")
//创建一个高亮度的滤镜
let passthroughFilter = GPUImageBrightnessFilter()
passthroughFilter.brightness = -0.5
passthroughFilter.forceProcessing(at: img!.size)
passthroughFilter.useNextFrameForImageCapture()
//获取数据源
let stillImageSource = GPUImagePicture(image: img)
stillImageSource?.addTarget(passthroughFilter)
stillImageSource?.processImage()
img = passthroughFilter.imageFromCurrentFramebuffer()
let imgView = UIImageView()
imgView.image = img
imgView.frame = CGRect(x: 0, y: 200, width: 200, height: 200)
view.addSubview(imgView)