What hobgoblin suggests is possibly less work intensive, though Photoshop method is very quick once you have done it a couple of times.
One drwaback by using programmes such as Hobgoblin suggests is that any automation takes away some degree of control over required parameters i.e. if one day you want to send a file for someone to print, or the other day it is merely to let them view it.
Although you have these options in the automatic programs, the degree of control you have over the quality is naturally not as good as a specifically designed photo editing suite.