如何将UIImage转换为CIImage，反之亦然
我试图从屏幕上显示的ImageView中获取CIImage 。
UIImage *image = myImageView.image;
将图像UIImage转换为CIImage 。
CIImage *cImage = [....];
这个怎么做？
CIImage *ciImage = [UIImage imageNamed:@"test.png"].CIImage; UIImage *uiImage = [[UIImage alloc] initWithCIImage:ciImage];
为了修复myUIImage.CIImage像[UIImageView image]一样返回零的情况，你可以改为[CIImage imageWithCGImage:myUIImage.CGImage] – Dylan Hand
虽然王长兴的回答是正确的，但苹果表示，UIImage.CIImage并不总是有效。 具体来说，从PocketCoreImage：
// Create a CIImage from the _inputImage. While UIImage has a property returning // a CIImage representation of it, there are cases where it will not work. This is the // most compatible route. _filteredImage = [[CIImage alloc] initWithCGImage:_inputImage.CGImage options:nil];
苹果也使用以下，这不适合我：
[UIImage imageWithCIImage:_filteredImage]
我的个人实施，从这个职位改编确实对我有用：
// result is a CIImage, output of my filtering. // returnImage is (obviously) a UIImage that I'm going to return. CIContext *context = [CIContext contextWithOptions:nil]; UIImage *returnImage = [UIImage imageWithCGImage:[context createCGImage:result fromRect:result.extent]];
这是最合适的做法：
UIImage* u =[UIImage imageNamed:@"image.png"]; CIImage* ciimage = [[CIImage alloc] initWithCGImage:u.CGImage];
现在使用ciimage …
这是我在项目中使用的完整代码示例。
- (UIImage *)makeUIImageFromCIImage:(CIImage *)ciImage { CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef cgImage = [context createCGImage:ciImage fromRect:[ciImage extent]]; UIImage* uiImage = [UIImage imageWithCGImage:cgImage]; CGImageRelease(cgImage); return uiImage; }
CIImage基本上是一个图像的配方。 如果您尝试直接从CIImage转换为UIImage则会遇到问题。 例如，打电话
NSData * UIImageJPEGRepresentation ( UIImage *image, CGFloat compressionQuality );
将返回nil 。
func toCIImage(image: UIImage) -> CIImage { return image.CIImage ?? CIImage(CGImage: image.CGImage!) } func toUIImage(image: CIImage) -> UIImage { return UIImage(CIImage: image) }
快速的答案的例子：
guard let ciimage = CIImage(image: uiimage) else { return } let image = UIImage(CIImage: ciimage)
