And based on this report, it has not been cheap for Warner Brothers.
http://www.homemediamagazine.com/comic-con/comic-con-2012-blasts-past-27803
http://www.homemediamagazine.com/comic-con/comic-con-2012-blasts-past-27803
Quote:
As much of a challenge that Singin’ in the Rain was, however, Feltenstein said the upcoming 3D Blu-ray release of House of Wax is even more problematic.
“The original negative of House of Wax was damaged in the lab and the emulsion was stripped off the original,” he said. “We have to go back into separation and scan them. It’s like doing six movies. All that is being scanned at 4K. My colleagues are writing a very big check, and you all are going to have House of Wax in 3D and it's going to look like a Viewmaster.”
Feltenstein had teased the House of Wax release at this panel last year, though the first of Warner’s classic 3D films to make it to Blu-ray will be Dial M for Murder Oct. 9.