无法从CIImage获取图像数据

Question

我正在使用CIImage和CIFilter进行图像过滤。之后，我试图通过UIImageJPEGRepresentation获取图像数据，但是我收到空数据。

CIImage *beginImage = [[CIImage alloc] initWithImage:sourceImage]; 

CIContext *context = [CIContext contextWithOptions:nil]; 

CIFilter *filter = [CIFilter filterWithName:effect keysAndValues:kCIInputImageKey, beginImage, nil]; 

CIImage *outputImage = [filter outputImage]; 

CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]]; 

UIImage *filteredImage = [UIImage imageWithCIImage:outputImage]; 
CGImageRelease(cgimg); 

NSData *imageData = UIImageJPEGRepresentation(filteredImage, 1.0); 

我得到空数据时，我控制台imageData。请检查我的上述代码，并让我知道我做错了什么。

Answer 1

//创建我们模糊的图像尝试这个希望它为你工作。

CIContext *context = [CIContext contextWithOptions:nil]; 
CIImage *inputImage = [CIImage imageWithCGImage:theImage.CGImage]; //theImage pass your image 
CIFilter *filter1 = [CIFilter filterWithName:@"CIGaussianBlur"]; 
[filter1 setValue:inputImage forKey:kCIInputImageKey]; 
CIImage *result = [filter1 valueForKey:kCIOutputImageKey]; 
CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]]; 
UIImage *returnImage = [UIImage imageWithCGImage:cgImage]; // returnImage is your blur image 
CGImageRelease(cgImage); 

Answer 2

你的问题是在这里你逝去的CIImage

UIImage *filteredImage = [UIImage imageWithCIImage:outputImage]; 

但是你需要通过CGImageRef同时创造UIImage写这个

UIImage *filteredImage = [[UIImage alloc] initWithCGImage:cgimg]; 

我希望它会帮助你