Automatic Picture Heights and Widths

Hi I was wandering if anyone knows how to take the height and width OFF the pictures when you insert your photos into your posting editor.

When I send a full size image into the content editor the newest version of wordpress gives it a height of 533px, and a width of 333px…..even though I click on full size. which Should be 600px by 400px

I want them as big as possible.

Any help would be great,
Thanks,
Tim