GPUImage 的部分使用和介绍

使用 GPUImage了。一个示例代码：

 1 - (void)viewDidLoad {2     [super viewDidLoad];34     UIImage *inputImage = [UIImage imageNamed:@"zzy"];5     //创建一个亮度的滤镜6 //    GPUImageBrightnessFilter *passthroughFilter = [[GPUImageBrightnessFilter alloc] init];7 //    passthroughFilter.brightness = -0.5f;8 //    //设置要渲染的区域9 //    [passthroughFilter forceProcessingAtSize:inputImage.size];10 //    [passthroughFilter useNextFrameForImageCapture];11 //    //获取数据源12 //    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:inputImage];13 //    //添加上滤镜14 //    [stillImageSource addTarget:passthroughFilter];15 //    //开始渲染16 //    [stillImageSource processImage];17 //    //获取渲染后的图片18 //    UIImage *newImage = [passthroughFilter imageFromCurrentFramebuffer];19 //    //加载出来20 //    UIImageView *imageView = [[UIImageView alloc] initWithImage:newImage];21 //    imageView.frame = CGRectMake(0,0,inputImage.size.width ,inputImage.size.height);22 //    [self.view addSubview:imageView];232425     //GPUImageStretchDistortionFilter *disFilter =[[GPUImageStretchDistortionFilter alloc] init];26     //GPUImageBulgeDistortionFilter *disFilter = [[GPUImageBulgeDistortionFilter alloc] init];27     //GPUImagePinchDistortionFilter *disFilter = [[GPUImagePinchDistortionFilter alloc] init];28     //GPUImageGlassSphereFilter *disFilter = [[GPUImageGlassSphereFilter alloc] init];29     //GPUImageSphereRefractionFilter *disFilter = [[GPUImageSphereRefractionFilter alloc] init];30     //GPUImageToonFilter *disFilter = [[GPUImageToonFilter alloc] init];31     GPUImageVignetteFilter *disFilter = [[GPUImageVignetteFilter alloc] init];32     //设置要渲染的区域33     [disFilter forceProcessingAtSize:inputImage.size];34     [disFilter useNextFrameForImageCapture];35     //获取数据源36     GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:inputImage];37     //添加上滤镜38     [stillImageSource addTarget:disFilter];39     //开始渲染40     [stillImageSource processImage];41     //获取渲染后的图片42     UIImage *newImage = [disFilter imageFromCurrentFramebuffer];43     //加载出来44     UIImageView *imageView = [[UIImageView alloc] initWithImage:newImage];45     imageView.frame = CGRectMake(50,50,inputImage.size.width ,inputImage.size.height);46     [self.view addSubview:imageView];47 }

GPUImage提供的过滤器很多，每个头文件就是一个过滤器，这里贴一个过滤器的简介：#import "GLProgram.h" // Base classes#import "GPUImageOpenGLESContext.h"#import "GPUImageOutput.h"#import "GPUImageView.h"#import "GPUImageVideoCamera.h"#import "GPUImageStillCamera.h"#import "GPUImageMovie.h"#import "GPUImagePicture.h"#import "GPUImageRawDataInput.h"#import "GPUImageRawDataOutput.h"#import "GPUImageMovieWriter.h"#import "GPUImageFilterPipeline.h"#import "GPUImageTextureOutput.h"#import "GPUImageFilterGroup.h"#import "GPUImageTextureInput.h"#import "GPUImageUIElement.h"#import "GPUImageBuffer.h" // Filters#import "GPUImageFilter.h"#import "GPUImageTwoInputFilter.h"#pragma mark - 调整颜色 Handle Color#import "GPUImageBrightnessFilter.h"                //亮度#import "GPUImageExposureFilter.h"                  //曝光#import "GPUImageContrastFilter.h"                  //对比度#import "GPUImageSaturationFilter.h"                //饱和度#import "GPUImageGammaFilter.h"                     //伽马线#import "GPUImageColorInvertFilter.h"               //反色#import "GPUImageSepiaFilter.h"                     //褐色（怀旧）#import "GPUImageLevelsFilter.h"                    //色阶#import "GPUImageGrayscaleFilter.h"                 //灰度#import "GPUImageHistogramFilter.h"                 //色彩直方图，显示在图片上#import "GPUImageHistogramGenerator.h"              //色彩直方图#import "GPUImageRGBFilter.h"                       //RGB#import "GPUImageToneCurveFilter.h"                 //色调曲线#import "GPUImageMonochromeFilter.h"                //单色#import "GPUImageOpacityFilter.h"                   //不透明度#import "GPUImageHighlightShadowFilter.h"           //提亮阴影#import "GPUImageFalseColorFilter.h"                //色彩替换（替换亮部和暗部色彩）#import "GPUImageHueFilter.h"                       //色度#import "GPUImageChromaKeyFilter.h"                 //色度键#import "GPUImageWhiteBalanceFilter.h"              //白平横#import "GPUImageAverageColor.h"                    //像素平均色值#import "GPUImageSolidColorGenerator.h"             //纯色#import "GPUImageLuminosity.h"                      //亮度平均#import "GPUImageAverageLuminanceThresholdFilter.h" //像素色值亮度平均，图像黑白（有类似漫画效果）#import "GPUImageLookupFilter.h"                    //lookup 色彩调整#import "GPUImageAmatorkaFilter.h"                  //Amatorka lookup#import "GPUImageMissEtikateFilter.h"               //MissEtikate lookup#import "GPUImageSoftEleganceFilter.h"              //SoftElegance lookup#pragma mark - 图像处理 Handle Image#import "GPUImageCrosshairGenerator.h"              //十字#import "GPUImageLineGenerator.h"                   //线条#import "GPUImageTransformFilter.h"                 //形状变化#import "GPUImageCropFilter.h"                      //剪裁#import "GPUImageSharpenFilter.h"                   //锐化#import "GPUImageUnsharpMaskFilter.h"               //反遮罩锐化#import "GPUImageFastBlurFilter.h"                  //模糊#import "GPUImageGaussianBlurFilter.h"              //高斯模糊#import "GPUImageGaussianSelectiveBlurFilter.h"     //高斯模糊，选择部分清晰#import "GPUImageBoxBlurFilter.h"                   //盒状模糊#import "GPUImageTiltShiftFilter.h"                 //条纹模糊，中间清晰，上下两端模糊#import "GPUImageMedianFilter.h"                    //中间值，有种稍微模糊边缘的效果#import "GPUImageBilateralFilter.h"                 //双边模糊#import "GPUImageErosionFilter.h"                   //侵蚀边缘模糊，变黑白#import "GPUImageRGBErosionFilter.h"                //RGB侵蚀边缘模糊，有色彩#import "GPUImageDilationFilter.h"                  //扩展边缘模糊，变黑白#import "GPUImageRGBDilationFilter.h"               //RGB扩展边缘模糊，有色彩#import "GPUImageOpeningFilter.h"                   //黑白色调模糊#import "GPUImageRGBOpeningFilter.h"                //彩色模糊#import "GPUImageClosingFilter.h"                   //黑白色调模糊，暗色会被提亮#import "GPUImageRGBClosingFilter.h"                //彩色模糊，暗色会被提亮#import "GPUImageLanczosResamplingFilter.h"         //Lanczos重取样，模糊效果#import "GPUImageNonMaximumSuppressionFilter.h"     //非最大抑制，只显示亮度最高的像素，其他为黑#import "GPUImageThresholdedNonMaximumSuppressionFilter.h" //与上相比，像素丢失更多#import "GPUImageSobelEdgeDetectionFilter.h"        //Sobel边缘检测算法(白边，黑内容，有点漫画的反色效果)#import "GPUImageCannyEdgeDetectionFilter.h"        //Canny边缘检测算法（比上更强烈的黑白对比度）#import "GPUImageThresholdEdgeDetectionFilter.h"    //阈值边缘检测（效果与上差别不大）#import "GPUImagePrewittEdgeDetectionFilter.h"      //普瑞维特(Prewitt)边缘检测(效果与Sobel差不多，貌似更平滑)#import "GPUImageXYDerivativeFilter.h"              //XYDerivative边缘检测，画面以蓝色为主，绿色为边缘，带彩色#import "GPUImageHarrisCornerDetectionFilter.h"     //Harris角点检测，会有绿色小十字显示在图片角点处#import "GPUImageNobleCornerDetectionFilter.h"      //Noble角点检测，检测点更多#import "GPUImageShiTomasiFeatureDetectionFilter.h" //ShiTomasi角点检测，与上差别不大#import "GPUImageMotionDetector.h"                  //动作检测#import "GPUImageHoughTransformLineDetector.h"      //线条检测 #import "GPUImageParallelCoordinateLineTransformFilter.h" //平行线检测 #import "GPUImageLocalBinaryPatternFilter.h"        //图像黑白化，并有大量噪点 #import "GPUImageLowPassFilter.h"                   //用于图像加亮 #import "GPUImageHighPassFilter.h"                  //图像低于某值时显示为黑 #pragma mark - 视觉效果 Visual Effect #import "GPUImageSketchFilter.h"                    //素描 #import "GPUImageThresholdSketchFilter.h"           //阀值素描，形成有噪点的素描 #import "GPUImageToonFilter.h"                      //卡通效果（黑色粗线描边） #import "GPUImageSmoothToonFilter.h"                //相比上面的效果更细腻，上面是粗旷的画风 #import "GPUImageKuwaharaFilter.h"                  //桑原(Kuwahara)滤波,水粉画的模糊效果；处理时间比较长，慎用 #import "GPUImageMosaicFilter.h"                    //黑白马赛克 #import "GPUImagePixellateFilter.h"                 //像素化 #import "GPUImagePolarPixellateFilter.h"            //同心圆像素化 #import "GPUImageCrosshatchFilter.h"                //交叉线阴影，形成黑白网状画面 #import "GPUImageColorPackingFilter.h"              //色彩丢失，模糊（类似监控摄像效果） #import "GPUImageVignetteFilter.h"                  //晕影，形成黑色圆形边缘，突出中间图像的效果 #import "GPUImageSwirlFilter.h"                     //漩涡，中间形成卷曲的画面 #import "GPUImageBulgeDistortionFilter.h"           //凸起失真，鱼眼效果 #import "GPUImagePinchDistortionFilter.h"           //收缩失真，凹面镜 #import "GPUImageStretchDistortionFilter.h"         //伸展失真，哈哈镜 #import "GPUImageGlassSphereFilter.h"               //水晶球效果 #import "GPUImageSphereRefractionFilter.h"          //球形折射，图形倒立 #import "GPUImagePosterizeFilter.h"                 //色调分离，形成噪点效果 #import "GPUImageCGAColorspaceFilter.h"             //CGA色彩滤镜，形成黑、浅蓝、紫色块的画面 #import "GPUImagePerlinNoiseFilter.h"               //柏林噪点，花边噪点 #import "GPUImage3x3ConvolutionFilter.h"            //3x3卷积，高亮大色块变黑，加亮边缘、线条等 #import "GPUImageEmbossFilter.h"                    //浮雕效果，带有点3d的感觉 #import "GPUImagePolkaDotFilter.h"                  //像素圆点花样 #import "GPUImageHalftoneFilter.h"                  //点染,图像黑白化，由黑点构成原图的大致图形 #pragma mark - 混合模式 Blend #import "GPUImageMultiplyBlendFilter.h"             //通常用于创建阴影和深度效果 #import "GPUImageNormalBlendFilter.h"               //正常 #import "GPUImageAlphaBlendFilter.h"                //透明混合,通常用于在背景上应用前景的透明度 #import "GPUImageDissolveBlendFilter.h"             //溶解 #import "GPUImageOverlayBlendFilter.h"              //叠加,通常用于创建阴影效果 #import "GPUImageDarkenBlendFilter.h"               //加深混合,通常用于重叠类型 #import "GPUImageLightenBlendFilter.h"              //减淡混合,通常用于重叠类型 #import "GPUImageSourceOverBlendFilter.h"           //源混合 #import "GPUImageColorBurnBlendFilter.h"            //色彩加深混合 #import "GPUImageColorDodgeBlendFilter.h"           //色彩减淡混合 #import "GPUImageScreenBlendFilter.h"               //屏幕包裹,通常用于创建亮点和镜头眩光 #import "GPUImageExclusionBlendFilter.h"            //排除混合 #import "GPUImageDifferenceBlendFilter.h"           //差异混合,通常用于创建更多变动的颜色 #import "GPUImageSubtractBlendFilter.h"             //差值混合,通常用于创建两个图像之间的动画变暗模糊效果 #import "GPUImageHardLightBlendFilter.h"            //强光混合,通常用于创建阴影效果 #import "GPUImageSoftLightBlendFilter.h"            //柔光混合 #import "GPUImageChromaKeyBlendFilter.h"            //色度键混合 #import "GPUImageMaskFilter.h"                      //遮罩混合 #import "GPUImageHazeFilter.h"                      //朦胧加暗 #import "GPUImageLuminanceThresholdFilter.h"        //亮度阈 #import "GPUImageAdaptiveThresholdFilter.h"         //自适应阈值 #import "GPUImageAddBlendFilter.h"                  //通常用于创建两个图像之间的动画变亮模糊效果 #import "GPUImageDivideBlendFilter.h"               //通常用于创建两个图像之间的动画变暗模糊效果 #pragma mark - 尚不清楚 #import "GPUImageJFAVoroniFilter.h" #import "GPUImageVoroniConsumerFilter.h"