When you analyze a novel or poem, you need to quote words from the original to support your argument. When analyzing television, it's equally useful to be able to "quote" images--as you can see in the pages of Television.
The convergence of computers, television, and the cinema in the 1990s has changed. Moreover, teachers, scholars, and students are not limiting themselves to still image captures. With relatively modest computer resources, anyone can capture sample clips to use for analysis and illustration
Television: Frame-Grab Tutorial encapsulates the process of preparing images/clips for Television and provides step-by-step instruction on how to grab still and motion images from video.