The new special effects are invisible, and perhaps immoral:

“Acting is all about honesty, but something like this makes what you see on screen a dishonest moment,” said a leading technician. “Everyone feels a bit dirty about it.”

Visual effects experts privately admit to changing actors’ expressions: opening or closing eyes; making a limp more convincing; removing breathing signs; eradicating blinking eyelids from a lingering gaze; or splicing together different takes of an unsuccessful love scene to produce one in which both parties look like they are enjoying themselves.

TimesOnline.Co.UK