Seems like this should be an easy question but couldn't get it to work after using the documents at http://www.imagemagick.org/script/command-line-processing.php?ImageMagick=lj6pre8q2iautc3ch6nuph1fc2#geometry.
All I'm trying to get is get my image to have a set width and set height at 450px wide and 300px height along with maintaining some of its aspect ratio. Which style can accomplish this?