I need to find out the position (x, y) and size (width, height) of a rectangle selection over an image, in as few steps as possible. This is because I need to repeat this manual process thousands of times.
For example With Preview, I can easily get the size of any selection but not the origin (or I don't how). If Preview's little back box also told me the origin of the selection my problem would be solved.
What can I use for this? If it's free, simple and/or comes with OS X, much better.