For reference, I use Photoshop CS5 Extended. I would prefer to find a way to do what I want in this software.
I often want to crop my pictures so that they fit a certain proportion (either for printing or online use). Even when I want the 1.5:1 ratio my camera produces by default, it's rare that I'm not looking to crop some element out on the edge of the frame.
I know that I can hold down shift while adjusting the cropping box from one of the corners, and it will constrain the proportion there. But is there any way to set a specific proportion for the crop tool to use?
At the moment, I go through a fairly labour intensive process of getting it "about right" and then literally counting the pixels to make it correct.