Eight pixels ber byte would indeed be more efficient, but the intent of this library was to make the hidden message as discreet as possible, rather than transmi

Eight pixels ber byte would indeed be more efficient, but the intent of this library was to make the hidden message as discreet as possible, rather than transmit as much hidden data as possible. By modifying only occasional pixels, in an unpredictable pattern (based on a secure hash of the key), my hope was that it would make detection more difficult. Whether I succeeded or not remains to be determined, I suppose.