1. A method comprising: receiving a plurality of video bitstreams corresponding to different sources, wherein each video bitstream comprises a corresponding sequence of video objects; performing chromatic adaptation on each sequence of video objects to generate local illumination video objects, wherein chromatic adaptation comprises adapting a chromaticity of each video object to match an illumination of a local background by employing an illumination reference common to all video objects; and rendering a video display signal comprising combining the local illumination video objects from the different sources into each frame of a plurality of frames.