GPUImage|GPUImage 快速入门(二) 模糊 GPUImage快速入门(二)模糊

可能错过的精彩

GPUImage 快速入门(一) 环境

高斯模糊

全局模糊

【GPUImage|GPUImage 快速入门(二) 模糊】texelSpacingMultiplier是模糊的强度，数值越大，模糊效果越明显
blurRadiusInPixels是像素范围，用于计算平均值。

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全局模糊

+ (UIImage *)applyGaussianBlur:(UIImage *)image { GPUImageGaussianBlurFilter *filter = [[GPUImageGaussianBlurFilter alloc] init]; filter.texelSpacingMultiplier = 5.0; filter.blurRadiusInPixels = 5.0; [filter forceProcessingAtSize:image.size]; GPUImagePicture *pic = [[GPUImagePicture alloc] initWithImage:image]; [pic addTarget:filter]; [pic processImage]; [filter useNextFrameForImageCapture]; return [filter imageFromCurrentFramebuffer]; }

局部模糊

GPUImageGaussianSelectiveBlurFilter可以部分模糊，也就是选区外模糊
excludeCircleRadius用来调整模糊区域

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局部模糊

+ (UIImage *)applyGaussianSelectiveBlur:(UIImage *)image{GPUImageGaussianSelectiveBlurFilter *filter = [[GPUImageGaussianSelectiveBlurFilter alloc] init]; //filter.texelSpacingMultiplier = 5.0; filter.excludeCircleRadius = 120 / 320.0; [filter forceProcessingAtSize:image.size]; GPUImagePicture *pic = [[GPUImagePicture alloc] initWithImage:image]; [pic addTarget:filter]; [pic processImage]; [filter useNextFrameForImageCapture]; return [filter imageFromCurrentFramebuffer]; }

补充系统 iOS8 后自带模糊

UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]; UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect]; effectView.frame = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT); [self.view addSubview:effectView];