Write UIImage along with metadata (EXIF, GPS, TIFF) in iPhone's Photo library

I am developing a project, where the requirements are: - User will open the camera through the application - Upon capturing an Image, some data will be appended to the captured image's metadata. I have gone through some of the forums. I tried to code this logic. I guess, I have reached to the point, but something is missing as I am not able to see the metadata that I am appending to the image. My code is: ``` - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)dictionary { [picker dismissModalViewControllerAnimated:YES]; NSData *dataOfImageFromGallery = UIImageJPEGRepresentation (image,0.5); NSLog(@"Image length: %d", [dataOfImageFromGallery length]); CGImageSourceRef source; source = CGImageSourceCreateWithData((CFDataRef)dataOfImageFromGallery, NULL); NSDictionary *metadata = (NSDictionary *) CGImageSourceCopyPropertiesAtIndex(source, 0, NULL); NSMutableDictionary *metadataAsMutable = [[metadata mutableCopy]autorelease]; [metadata release]; NSMutableDictionary *EXIFDictionary = [[[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyExifDictionary]mutableCopy]autorelease]; NSMutableDictionary *GPSDictionary = [[[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyGPSDictionary]mutableCopy]autorelease]; if(!EXIFDictionary) { //if the image does not have an EXIF dictionary (not all images do), then create one for us to use EXIFDictionary = [NSMutableDictionary dictionary]; } if(!GPSDictionary) { GPSDictionary = [NSMutableDictionary dictionary]; } //Setup GPS dict - //I am appending my custom data just to test the logic…….. [GPSDictionary setValue:[NSNumber numberWithFloat:1.1] forKey:(NSString*)kCGImagePropertyGPSLatitude]; [GPSDictionary setValue:[NSNumber numberWithFloat:2.2] forKey:(NSString*)kCGImagePropertyGPSLongitude]; [GPSDictionary setValue:@"lat_ref" forKey:(NSString*)kCGImagePropertyGPSLatitudeRef]; [GPSDictionary setValue:@"lon_ref" forKey:(NSString*)kCGImagePropertyGPSLongitudeRef]; [GPSDictionary setValue:[NSNumber numberWithFloat:3.3] forKey:(NSString*)kCGImagePropertyGPSAltitude]; [GPSDictionary setValue:[NSNumber numberWithShort:4.4] forKey:(NSString*)kCGImagePropertyGPSAltitudeRef]; [GPSDictionary setValue:[NSNumber numberWithFloat:5.5] forKey:(NSString*)kCGImagePropertyGPSImgDirection]; [GPSDictionary setValue:@"_headingRef" forKey:(NSString*)kCGImagePropertyGPSImgDirectionRef]; [EXIFDictionary setValue:@"xml_user_comment" forKey:(NSString *)kCGImagePropertyExifUserComment]; //add our modified EXIF data back into the image’s metadata [metadataAsMutable setObject:EXIFDictionary forKey:(NSString *)kCGImagePropertyExifDictionary]; [metadataAsMutable setObject:GPSDictionary forKey:(NSString *)kCGImagePropertyGPSDictionary]; CFStringRef UTI = CGImageSourceGetType(source); NSMutableData *dest_data = [NSMutableData data]; CGImageDestinationRef destination = CGImageDestinationCreateWithData((CFMutableDataRef) dest_data, UTI, 1, NULL); if(!destination) { NSLog(@"--------- Could not create image destination---------"); } CGImageDestinationAddImageFromSource(destination, source, 0, (CFDictionaryRef) metadataAsMutable); BOOL success = NO; success = CGImageDestinationFinalize(destination); if(!success) { NSLog(@"-------- could not create data from image destination----------"); } UIImage * image1 = [[UIImage alloc] initWithData:dest_data]; UIImageWriteToSavedPhotosAlbum (image1, self, nil, nil); } ``` Kindly, help me to do this and get something positive. Look at the last line, am I saving the image with my metadata in it? The image is getting saved at that point, but the metadata that I am appending to it, is not getting saved. Thanks in advance.