iOS: Image get rotated 90 degree after saved as PN

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

Try this, You can use

NSData *somenewImageData = UIImageJPEGRepresentation(newimg,1.0);

instead of

NSData *somenewImageData = UIImagePNGRepresentation(newimg);

Answer 2

I found this code here, which actually fixed it for me. For my app, I took a picture and saved it, and everytime I loaded it, it would have the annoying rotation attached (I looked up, and it's apparently something to do with the EXIF and the way iPhone takes and stores images). This code fixed it for me. I have to say, it was originally as an addition to a class / an extension /category (you can find the original from the link. I used it like below as a simple method, as I didn't really want to make a whole class or category for just this. I only used portrait, but I think the code works for any orientation. I'm not sure though

Rant over, here's the code:

- (UIImage *)fixOrientationForImage:(UIImage*)neededImage {

    // No-op if the orientation is already correct
    if (neededImage.imageOrientation == UIImageOrientationUp) return neededImage;

    // We need to calculate the proper transformation to make the image upright.
    // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
    CGAffineTransform transform = CGAffineTransformIdentity;

    switch (neededImage.imageOrientation) {
        case UIImageOrientationDown:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, neededImage.size.width, neededImage.size.height);
            transform = CGAffineTransformRotate(transform, M_PI);
            break;

        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
            transform = CGAffineTransformTranslate(transform, neededImage.size.width, 0);
            transform = CGAffineTransformRotate(transform, M_PI_2);
            break;

        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, 0, neededImage.size.height);
            transform = CGAffineTransformRotate(transform, -M_PI_2);
            break;
        case UIImageOrientationUp:
        case UIImageOrientationUpMirrored:
            break;
    }

    switch (neededImage.imageOrientation) {
        case UIImageOrientationUpMirrored:
        case UIImageOrientationDownMirrored:
            transform = CGAffineTransformTranslate(transform, neededImage.size.width, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;

        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRightMirrored:
            transform = CGAffineTransformTranslate(transform, neededImage.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
        case UIImageOrientationUp:
        case UIImageOrientationDown:
        case UIImageOrientationLeft:
        case UIImageOrientationRight:
            break;
    }

    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    CGContextRef ctx = CGBitmapContextCreate(NULL, neededImage.size.width, neededImage.size.height,
                                             CGImageGetBitsPerComponent(neededImage.CGImage), 0,
                                             CGImageGetColorSpace(neededImage.CGImage),
                                             CGImageGetBitmapInfo(neededImage.CGImage));
    CGContextConcatCTM(ctx, transform);
    switch (neededImage.imageOrientation) {
        case UIImageOrientationLeft:
        case UIImageOrientationLeftMirrored:
        case UIImageOrientationRight:
        case UIImageOrientationRightMirrored:
            // Grr...
            CGContextDrawImage(ctx, CGRectMake(0,0,neededImage.size.height,neededImage.size.width), neededImage.CGImage);
            break;

        default:
            CGContextDrawImage(ctx, CGRectMake(0,0,neededImage.size.width,neededImage.size.height), neededImage.CGImage);
            break;
    }

    // And now we just create a new UIImage from the drawing context
    CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
    UIImage *img = [UIImage imageWithCGImage:cgimg];
    CGContextRelease(ctx);
    CGImageRelease(cgimg);
    return img;
}

I'm not sure how useful this will be for you, but I hope it helped :)