 The majority of Sleepy Hollow's 150 visual effects shots were handled by Industrial Light & Magic (ILM), while Kevin Yagher supervised the human and creature effects. Framestore also assisted on digital effects, and The Mill handled motion control photography. In part a reaction to the computer-generated effects in Mars Attacks!, Burton opted to use as limited an amount of digital effects as possible. Ray Park, who served as the Headless Horseman stunt double, wore a blue ski mask for the chroma key effect, digitally removed by ILM. Burton and Heinrichs applied to Sleepy Hollow many of the techniques they had used in stop motion animation on Vincent — such as forced perspective sets.
