Roto Artists trace the areas of live action frames where computer graphics will overlap or interact with live images. This creates clear areas (mattes) within the frame to allow all elements of the scene to be layered convincingly. This enables Compositors to combine all the various elements accurately. The role of Roto Artist exists more often on special effects work, within facility houses or on projects that combine live action and computer graphics.
Paint/Prep Artists are briefed by Paint/Prep Leads or Comp Leads on the Paint Prep and wire/rig removal tasks for a particular shot or sequence. This includes Grain removal and grain matching, Generation of clean patches through collaging or clone painting on still frames, Image transformation, point/planar tracking, Basic matte generation through rotoscoping, luminance, chrominance and difference keying and many more.