Tension Software (www.tensionsoftware.com) has updated Precise Screenshot, a Mac OS X tools for snapping screenshots, to version 1.1.1. It’s a maintenance upgrade with bug fixes.
Precise Screenshot can select a resizable portion of the screen with the usual drag method or it can use pre-fixed size area from a customizable popup menu (with the sizes the user needs) or also use the full screen area. Specifying a new specific screen size to take screenshot is a matter of selecting it from the custom popup (or resizing and dragging it in the traditional way).
Precise Screenshot requires Mac OS X 10.8 or higher and costs US$4.99. It’s available at the Mac App Store.