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

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。

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

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];

GPUImage 快速入门(三) 滤镜效果(持续更新)