40.4.2.2.3 8-bit Luminance Channel

The 32-bpp ARGB final pixel is converted into an 8-bit luminance value.

Y = 0.299 R + 0.587 G + 0.114 B

Table 40-23. 8-bit Luminance Memory Mapping, Little Endian Organization
Mem. addr.	0x3								0x2								0x1								0x0
Bit	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
Alpha	Y3								Y2								Y1								Y0

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