#1 width-height ratio of photo screwed up

I noticed that (in both version 0.2 & 0.4) on a photo that is 500(H) x 332(W), i cannot use 90 tiles in both X & Y direction, with tiles of sizes 45(H) x 30(W).

Because then the original photo is not used in its correct sizes, it is deformed. In both directions part of the photo is cut away.

When I use 80 tiles horizontally & 120 tiles vertically, with square tiles of sizes 32x32, it works correctly. But I dont want that because my sourceimages are not square.