Can you help me turning this photo in 1) Gray , then 2) Black and White , 3 ) Six bit colours and and eventually 4) 12 bit colours?

Okay , so I have the picture included in this post . Can somebody give me an idea on how to turn this picture into following nuances? I do not have much knowledges related to Matlab Image Processing Toolbox . So , some assistance would be appresciated . Thank you and have a great day!