Email jpg created in app including metadata

Question

I have successfully added metadata to a jpg created within the app and saved it to the Camera Roll using the

writeImageToSavedPhotosAlbum: metadata: complet         


        

Answer 1

UIImage doesn't hold any metadata. If you have the path for the image read data directly from it. If you get the image back from camera roll there's the imagePickerController:didFinishPickingMediaWithInfo: method from UIImagePickerDelegate which also contains the metadata inside the info dictionary.

Also the mimeType should be "image/jpeg".

Edit: To add metadata to a UIImage you can use the ImageIO framework: You can create a CGImageDestination object from a UIImage, add metadata to it using CGImageDestinationSetProperties and then get the raw data (which includes the compressed image and the metadata) from it

Answer 2

Here is an example code to attach metadata to a NSMutableData object, which can be mailed.

UIImage* yourImage = ... from somewhere ...
NSDictionary* info = ... in my case from didFinishPickingMediaWithInfo:

CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef) UIImageJPEGRepresentation(yourImage, 0.5 /* compression factor */), NULL);

NSMutableData* imageData = [NSMutableData data];

CGImageDestinationRef imageDest = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)imageData, kUTTypeJPEG, 1, NULL);
CGImageDestinationAddImageFromSource(imageDest, source, 0, (__bridge CFDictionaryRef)info[@"UIImagePickerControllerMediaMetadata"]);
CGImageDestinationFinalize(imageDest);

CFRelease(imageDest);
CFRelease(source);

// at this point, imageData will contain your image + metadata