I was recently looking through a large Xcode project directory searching for a specific image – unfortunately, the image names were of little help. What I needed was a means to quickly look at each image without loading files in Preview or another image application.
Quick look is the answer, which is as close as one tap away.
Simply move the mouse over a file in Finder and tap once with three fingers, shazam, the document is viewable. For an equally quick way to close the doc, use Esc or Command-w.