On Stranger Tides his inspiration for the ambience of the series, while his true inspiration was "On Stranger Tides". In 2007, after the successful opening weekend of the third "Pirates of the Caribbean" film, "", Walt Disney Studios Chairman Dick Cook said he was interested in a fourth film. The Los Angeles Times also reported that Bruckheimer already had rights to a book that could end up as another installment, though had not confirmed what book it was. On September 11, 2009, Walt Disney Pictures announced that the fourth installment would be titled "". The announcement had fueled speculation that the film would
Pirates of the Caribbean: On Stranger Tides at the 007 Stage on Pinewood. "On Stranger Tides" employed 1,112 shots of computer-generated imagery, which were done by ten visual effects companies. Cinesite visual effects supervisor Simon Stanley-Clamp claimed that the most difficult part was doing the effects in 3D: "Rotoscoping is tricky. Cleaning up plates is double the work, and tracking has to be spot on." The lead companies, with over 300 effects each, were Industrial Light & Magic—responsible for, among others, the mermaids and most water effects—and Moving Picture Company, who created digital ships and environment extensions, such as changing weather and designing cliffs and waterfalls. Filming