FastStone Image Viewer
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Full user review
"Best for Printing Pictures"
For printing pictures, it was awesome. It allows you to have precise control over margins, how many inches (or centimetres) wide, Landscape, Portrait, automatic scaling of the aspect ratio and even gamma correction. I was having trouble printing images with Windows Live Photo Gallery as my printer seemed to completely ignore how wide and tall I wanted the picture to be.
Can't do much else other softwares cannot.