I would like to know if there is a systematical way (software) to capture a fixed region on the screen, under Windows 7 or OS X.
It must be accurate about the region. I always want to capture the region with left-top coordinate (300, 300) and right-bottome coordinate (800, 800).
So I can't not select the region by mouse myself. A software to do this capture should let me to input the 2 coordinates.