In List View, no. Sorry!
In Column View, open up the View Options and check "Show Preview Column". Click on an image, and in the Preview column, under the preview, there should be a list of information. The item marked Dimensions has what you are looking for.
There's also a way that works for all three views that involves the Get Info pane *in Finder* rather than in Preview. Click on an item, and hit Command+I. Open up the "More Info" section of the Info window (at the far left of the screen), and the Dimensions appear.
Message was edited by: andlabs
Message was edited by: andlabs