I normally don't print my pictures due to the expensive nature of developing. But recently I tried to experiment using Photoshop and did a 6R collage with nice borders and stuff believing 6R is really 6in x 8in.. but what I got is 5.x in by 7.x in. Its just a bit off but my border is ruined. My question is... is 6R (or other sizes) really like this? The size is just an approximation? Is the size really in different measurement (i.e. cm)?