图片滤镜

GPUImagePicture 用于已拍摄的图片加滤镜

直接上代码：

- (UIImage *)imageProcessdUsingGPUImage:(UIImage *)imageToProcess {    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc]initWithImage:imageToProcess];    // 设置滤镜    GPUImageSepiaFilter *stillImageFilter = [[GPUImageSepiaFilter alloc]init];    [stillImageSource addTarget:stillImageFilter];    [stillImageFilter useNextFrameForImageCapture];    [stillImageSource processImage];        UIImage *currentFilteredVideoFrame = [stillImageFilter imageFromCurrentFramebuffer];    return currentFilteredVideoFrame;}复制代码

效果图：

处理图片的方法有多种：CPU、CoreImage、GPUImage

具体可参考：

GPUImageStillCamera 用于实时拍摄照片加滤镜

直接上代码：

- (void)configGPUImageView {    // 可视的预览view    GPUImageView *imageView = [[GPUImageView alloc]initWithFrame:self.view.frame];    imageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;    imageView.fillMode = kGPUImageFillModePreserveAspectRatio;    self.view = imageView;        // 创建滤镜    self.filter = [[GPUImageSketchFilter alloc]init];        // 创建Camera    self.stillCamera = [[GPUImageStillCamera alloc]initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack];    _stillCamera.outputImageOrientation = UIInterfaceOrientationPortrait;        [_stillCamera addTarget:_filter];    [_filter addTarget:imageView];    [_stillCamera startCameraCapture];}// 拍摄- (void)buttonAction {    [_stillCamera capturePhotoAsJPEGProcessedUpToFilter:_filter withCompletionHandler:^(NSData *processedJPEG, NSError *error) {        ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];        [library writeImageDataToSavedPhotosAlbum:processedJPEG metadata:self.stillCamera.currentCaptureMetadata completionBlock:^(NSURL *assetURL, NSError *error) {            if (error) {                NSLog(@"ERROR: failed");            }else {                NSLog(@"SUCCESS: saved");            }        }];    }];}复制代码

效果图：