I want to convert a CIImage to UIImage but failed

Question

I have a CIImage with format kCVPixelFormatType_420YpCbCr8BiPlanarFullRange(YCC420f or N12), now I want to see what the image looks like, so I convert it to UIImage use this method:

CIImage *ciImage = [CIImage imageWithCVPixelBuffer:new_buffer];

CIContext *temporaryContext = [CIContext contextWithOptions:nil];
CGImageRef videoImage = [temporaryContext
                          createCGImage:ciImage
                               fromRect:CGRectMake(0, 0,
                                        CVPixelBufferGetWidth(new_buffer),
                                        CVPixelBufferGetHeight(new_buffer))];

UIImage *uiImage = [UIImage imageWithCGImage:videoImage];

It's works fine when the image's format is BGRA, but not for NV12, error message in console:

Render failed because a pixel format YCC420f is not supported.

Btw, the ciimage comes from a CVPixelBufferRef, and the CVPixelBufferRef comes from an address of a GL texture.

Now, what should I do?

use UIImage *uiImage = [[UIImage alloc] initWithCIImage:ciImage]; not imageWithCGImage: — AleyRobotics, Aug 19 '16 at 13:42
@Yuri same problem. And CIImage->CGImageRef->UIImage is better, imageWithCIImage may return `nil` with no error message sometimes. — Klein Mioke, Aug 22 '16 at 07:31
Works form ios 7 : UIImage *uiImage = [[UIImage alloc] initWithCIImage:ciImage]; — Adeel, Jul 12 '17 at 06:22

score 0 · Answer 1 · answered Jul 12 '17 at 06:23

0

Just a simple line of code (Available from IOS 5.0)

UIImage *uiImage = [[UIImage alloc] initWithCIImage:ciImage];

answered Jul 12 '17 at 06:23

Adeel

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I want to convert a CIImage to UIImage but failed

1 Answers1