How do I add the image orientation exif metadata information on an image saved on the camera roll?

Question

After post-producing the pictures taken with the iphone camera and saving them to the camera roll, I see the final result is being saved without the orientation information.

When the iPhone reads these pictures, it reads orientation = "0", that is "taken with the iphone button on the right", and that messes all up.

How do I save the orientation metadata on the picture going to the camera roll?

thanks for any help.

Answer 1

If I remember correctly, the only way was to render processed image in a correct orientation yourself and then save it.