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

Question

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:

Answer 1

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.

Answer 2

Swift 3.1 version of the UIImage extension posted by Rao:

extension UIImage {     func fixOrientation() -> UIImage {         if self.imageOrientation == UIImageOrientation.up {             return self         }         UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)         self.draw(in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))         if let normalizedImage: UIImage = UIGraphicsGetImageFromCurrentImageContext() {             UIGraphicsEndImageContext()             return normalizedImage         } else {             return self         }     } } 

Usage:

let cameraImage = //image captured from camera let orientationFixedImage = cameraImage.fixOrientation() 

Swift 4/5:

UIImageOrientation.up has been renamed to UIImage.Orientation.up