iOS: Image get rotated 90 degree after saved as PNG representation data

I have researched enough to get this working but not able to fix it. After taking picture from camera as long as I have image stored as UIImage, it's fine but as soon as I stored this image as PNG representation, its get rotated 90 degree.

Following is my code and all things I tried:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
    NSString *mediaType = [info valueForKey:UIImagePickerControllerMediaType];

    if([mediaType isEqualToString:(NSString*)kUTTypeImage]) 
        AppDelegate *delegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
        delegate.originalPhoto  = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        NSLog(@"Saving photo");
        [self saveImage];
        NSLog(@"Fixing orientation");
        delegate.fixOrientationPhoto  = [self fixOrientation:[UIImage imageWithContentsOfFile:[delegate filePath:imageName]]];      
        NSLog(@"Scaling photo");
        delegate.scaledAndRotatedPhoto  =  [self scaleAndRotateImage:[UIImage imageWithContentsOfFile:[delegate filePath:imageName]]];
    [picker dismissModalViewControllerAnimated:YES];
    [picker release];

- (void)saveImage
    AppDelegate *delegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    NSData *imageData = UIImagePNGRepresentation(delegate.originalPhoto);
    [imageData writeToFile:[delegate filePath:imageName] atomically:YES];

Here fixOrientation and scaleAndRotateImage functions taken from here and here respectively. They works fine and rotate image when I apply them on UIImage but doesn't work if I save image as PNG representation and apply them.

Please refere the following picture after executing above functions:

The first photo is original, second is saved, and third and fourth after applying fixorientation and scaleandrotate functions on saved image


  • Starting with iOS 4.0 when the camera takes a photo it does not rotate it before saving, it

    simply sets a rotation flag in the EXIF data of the JPEG.If you save a UIImage as a JPEG, it

    will set the rotation flag.PNGs do not support a rotation flag, so if you save a UIImage as a

    PNG, it will be rotated incorrectly and not have a flag set to fix it. So if you want PNG

    images you must rotate them yourself, for that check this link.