 Post @-@ production was handled by Montreal 's Meteor Studios and Hybride Technologies filled in the bluescreen footage with more than 1 @,@ 500 visual effects shots . Visual effects supervisor Chris Watts and production designer Jim Bissell created a process dubbed " The Crush , " which allowed the Meteor artists to manipulate the colors by increasing the contrast of light and dark . Certain sequences were desaturated and tinted to establish different moods . Ghislain St @-@ Pierre , who led the team of artists , described the effect : " Everything looks realistic , but it has a kind of a gritty illustrative feel . " Various computer programs , including Maya , RenderMan and RealFlow , were used to create the " spraying blood . " The post @-@ production lasted for a year and was handled by a total of ten special effects companies . 
