4-bit Alpha Channel with 4-bit Luminance

The 24-bpp RGB final pixel is converted into an 8-bit luminance value and then truncated.

Y = \frac{0.299 R + 0.587 G + 0.114 B}{16}

Table 5-92. 4-bit Alpha Channel with 4-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
Pixel A4IDX4	A3				Y3				A2				Y2				A1				Y1				A0				Y0

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