We have big mono 10 or 12LSB pixel image like:
0000AAAA AAAAAAAA 0000BBBB BBBBBBBB....
We hope to pack them like: AAAAAAAAAAAABBBBBBBBBBBB.....
We cansave 1 byte for each 2 pixels.
we do not have functions which process images with such packed format and we do not have functions to convert to/from such packet format.