The Computer Animation Production System (CAPS) was the first digital ink and paint system used in animated feature films, designed to replace the expensive process of transferring animated drawings to cels using India ink or xerographic technology, and painting the reverse sides of the cels with gouache paint. Using CAPS, enclosed areas and lines could be easily colored in the digital computer environment using an unlimited palette. Transparent shading, blended colors and other sophisticated techniques could be extensively used that were not previously available.