data packets

[winners]

I have some questions regarding CMUCam2's data packets, Type F data packet format,

Type F data packet format:

1 2 r g b r g b ... r g b r g b 2 r g b r g b ... r g b r g b 3

1 - new frame 2 - new row 3 - end of frame
RGB (CrYCb) ranges from 16 - 240
RGB (CrYCb) represents two pixels color values. Each pixel shares the red and
blue.

well, first of, "RGB (CrYCb) ranges from 16 - 240" -> is it 1 number for the whole RGB or that R has a number that ranges from 16-240 and G has another one, and R has another one?

Secondly, can anyone please explain to me what is CrYCb and how it differs from YCrCb and is there any other type?

Last thing, "RGB (CrYCb) represents two pixels color values. Each pixel shares the red and blue." -> what does it mean: "shares"?

I appreciate your time reading and helping me.

Thanks in advance.