For the Washington Post's Fancy Stats blog, Neil Greenberg used TruMedia's heat maps to show the extra strike calls that Wilson Ramos' framing provides:
"Ramos also gives the Phillies another catcher who can frame pitches. With Knapp behind the plate, Philadelphia’s pitchers get a called strike on pitches out of the zone 5.4 percent of the time, per TruMedia; Ramos has a 7.2 percent called-strike rate on those pitches, just slightly lower than Alfaro (7.8 percent). The league average is 7.2 percent."
Full article: Washington Post