HP L 5 manual Luminance-Chrominance Long Form

Byte	15 (msb)	8	7	(lsb) 0	Byte
76	Maximum green value (lsw)				77
78	Minimum blue value (msw)				79
80	Minimum blue value (lsw)				81
82	Maximum blue value (msw)				83
84	Maximum blue value (lsw)				85

Note	HP Color LaserJet 5 and 5M printers bypass the Colorimetric RGB
	process. In place of it, a device-dependent RGB process is
	substituted with a Screen Match color table.

Luminance-Chrominance (Long Form)

The long form for Luminance-Chrominance allows color spaces other than the default YUV, such as Kodak Photo YCC, the proposed JPEG and TIFF 6.0 YCrCb standard, YES, and YIQ. These Luminance-Chrominance color spaces are derived from the Colorimetric RGB space using a 3x3 transformation matrix. The tristimulus luminance y value of the white point is assumed to be 100% and is therefore not specified.

Byte	15 (msb)	8		7	(lsb) 0	Byte
0	Color space			Pixel encoding mode		1
2	Bits per index			Bits per primary #1		3
4	Bits per primary #2			Bits per primary #3		5
6	Encoding for primary		#1 R (msw)			7
8	Encoding for primary		#1 R (lsw)			9
10	Encoding for primary		#1 G (msw)			11
12	Encoding for primary		#1 G (lsw)			13
14	Encoding for primary		#1 B (msw)			15
16	Encoding for primary		#1 B (lsw)			17
18	Encoding for primary		#2 R (msw)			19
20	Encoding for primary		#2 R (lsw)			21

B-22 Using Color Modes (Color LaserJet, 5, 5M, DeskJet) EN