CompuServe Messages

<<Most films are done in 8 bit, 10, or 12. Rarely is 16 bit used due to the tremendous computational and storage requirements it uses.>> I understand that the 16 million possible colours available with 8 bit RGB channels is more than the human eye can differentiate, so why use 10,12, or 16 bit channels. Is additional information stored in these "extra" bits? Thanks. DaviD "Cones and rods" GouID