Shutter provides a tool to capture a rectangular region of your screen. The selection can be resized and moved. Also, there is a dialog that allows you to enter the width, height, X and Y position of the selection manually. The screen can be zoomed (with Ctrl+Mouse wheel), a small zoom window sitting in the screen corner shows the surroundings of the mouse cursor.
Position and dimensions dialog
You’ll see a nice animated effect when hovering over the windows on your desktop with your mouse displaying the window title and geometry of the currently selected window.
Capture menus and tooltips
When capturing a menu or a tooltip, there is a sufficiently long delay to make the menu or tooltip visible on the screen.