Hi there 
we have a Riva 125 minolta camera that takes just normal 35mm film and
when the pics are developed they are 6 X 4 inch photos
but on our new Olympus digital camera...we find that the pics at 
2048 X 1538....equal 8.1X6 inch
and if we size this down it comes out at 6 X 4.5

and
1024 X 768....equal 5.1 X 3.8 inch

so why are they different?...one would think in a perfect world that
it would be set so!.....how annoying