For each CFA color index, define its (r,g,b) contribution. Standard Bayer: 0->R, 1->G, 2->B Extended: approximate spectral response

Holds the bits we need to (optionally) reproduce the DICOM display pipeline. Each member maps directly to a DICOM attribute.

Huffman code table entry: {code_bits, code_length, run_length, is_terminating}