Why is Blender rendering my vertical image distorted? I want to render out an vertical image of my model. It should be complete visible but with no unused space.

I've changed the Dimensions of the output like that:


In Blender the camera view looks now like that:


but the output looks like that:


How can I print out the expected result?
To expand on @rjg's comment, your aspect ratio (just below the image dimensions) makes your image's pixels non-square, thus squashing the final result.