From Limit Point Software:
is a Mac menu bar application for creating clipboard snapshots of the windows on your Mac in any application, for any application, and more. Features include: scaling, composite, trimmed composites, filter effects, timed shots. Using its special features WindowClipMBI can create screenshots not possible (or not as easily) with other methods.
To use: Install and run the application. Click on the menu bar icon for WindowClipMBI to display its menu. The menu shows the windows currently displayed by your Mac. Make a menu selection corresponding to the window you want to take a snapshot of. The image of the window is put on the clipboard, signaled by the harp sound.
Use the preference window, or the menu itself, to specify various options such as: scaling, reflections, showing cursor in screen shots, include Desktop windows, ignore framing effects like shadows, and creating an opaque image.
WindowClipMBI is a member of the Limit Point Software Utilities bundle. See http://www.limit-point.com/Utilities.html for a complete list of available utilities included. One donation activates all the software. Upgrades free, new products are included.