Ive built a site mainly consisting of image galleries for an artist.

The images are looking great in the usual browsers,but there is a problem in IE.

In IE 9 and 10 the images have a slightly lower resolution, UNLESS I switch to compatibility view. Then they look as they should.

How can I make the images view properly without having to turn on compatibility view? And why is it doing this...could it be a fault in my coding?