You don’t have to waste time cropping your captures. DuckCapture exactly what you need. Capture Modes make it easy: in addition to full screen capture, the other three useful modes:
* Capture a window: Get just the window, not the stuff behind or around it.
* Capture a region: Draw a box on the screen and capture whatever is inside.
* Scrolling Web Page Mode: Capture a tall window by auto-scrolling. Can’t fit it on the screen? DuckCapture auto-scrolls the window and grabs it all!
http://www.ducklink.com/screen-capture-tool/