Swift

Core Image是一个强大的滤镜处理框架。它除了可以直接给图片添加各种内置滤镜，还能精确地修改鲜艳程度, 色泽, 曝光等，下面通过两个样例演示如何给UIImage添加滤镜。

1，棕褐色滤镜  - CISepiaTone

这个有点复古老照片发黄的效果（上面一张是原图）。

扩展UIImage类，添加棕褐色滤镜：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

import UIKit   //--- UIImageFilterExtension.swift --- extension UIImage {     //棕褐色复古滤镜（老照片效果）     func sepiaTone() -> UIImage?     {         let imageData = UIImagePNGRepresentation(self)         let inputImage = CoreImage.CIImage(data: imageData!)         let context = CIContext(options:nil)         let filter = CIFilter(name:"CISepiaTone")         filter!.setValue(inputImage, forKey: kCIInputImageKey)         filter!.setValue(0.8, forKey: "inputIntensity")         if let outputImage = filter!.outputImage {             let outImage = context.createCGImage(outputImage, fromRect: outputImage.extent)             return UIImage(CGImage: outImage)         }         return nil     } }

使用样例：

1	imageView1.image = UIImage(named:"img2.jpg")?.sepiaTone()

2，黑白滤镜 - CIPhotoEffectNoir

 

扩展UIImage类，添加黑白滤镜：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

import UIKit   //--- UIImageFilterExtension.swift --- extension UIImage {     //黑白效果滤镜     func noir() -> UIImage?     {         let imageData = UIImagePNGRepresentation(self)         let inputImage = CoreImage.CIImage(data: imageData!)         let context = CIContext(options:nil)         let filter = CIFilter(name:"CIPhotoEffectNoir")         filter!.setValue(inputImage, forKey: kCIInputImageKey)         if let outputImage = filter!.outputImage {             let outImage = context.createCGImage(outputImage, fromRect: outputImage.extent)             return UIImage(CGImage: outImage)         }         return nil     } }

使用样例：

1	imageView1.image = UIImage(named:"img2.jpg")?.noir()

原文出自：www.hangge.com  转载请保留原文链接：http://www.hangge.com/blog/cache/detail_889.html