22. The computer readable media defined in claim 13 wherein the codestream includes a plurality of layers of coded data and where accessing the header data comprises accessing header data connected with one of the layers.
22. The computer readable media defined in claim 13 wherein the codestream includes a plurality of layers of coded data and where accessing the header data comprises accessing header data connected with one of the layers. 23. The computer readable media defined in claim 22 wherein the plurality of layers comprises a luminescence layer, a chrominance layer, and a layer for the remaining bits.