Celine Latulipe Ian Bell Charles L. A. Clarke Craig S. Kaplan symTone: two-handed manipulation of tone reproduction curves. 9-16 2006 conf/graphicsinterface/2006 Graphics Interface http://doi.acm.org/10.1145/1143079.1143082 db/conf/graphicsinterface/graphicsinterface2006.html#LatulipeBCK06