'Experts in video effects said Mr Obama's talk on boosting employment had actually been recorded in front of a neutral "green screen" and the factory background filled in later.

They said the edges around the president's head and shoulders were too sharp.

"The shot is obviously a composite and a 'weatherman quality' one," one professional in the field told BigGovernment website. "President Obama doesn't blend into the scene at all." The White House denied the accusations.'

Read more: White House Accused of Barack Obama 'Green Screen' Trickery