2.7.1.3. Luma-Only Formats

This family of formats only store the luma component of a Y’CbCr image. They are often referred to as greyscale formats.

Note

• In all the tables that follow, bit 7 is the most significant bit in a byte.

• Formats are described with the minimum number of pixels needed to create a byte-aligned repeating pattern. ... indicates repetition of the pattern.

• Y’_x[9:2] denotes bits 9 to 2 of the Y’ value for pixel at column x.

• 0 denotes padding bits set to 0.

Luma-Only Image Formats

Identifier	Code	Byte 0	Byte 1	Byte 2	Byte 3	Byte 4
V4L2_PIX_FMT_GREY	‘GREY’	Y’0[7:0]	...	...	...	...
V4L2_PIX_FMT_IPU3_Y10	‘ip3y’	Y’0[7:0]	Y’1[5:0] Y’0[9:8]	Y’2[3:0] Y’1[9:6]	Y’3[1:0] Y’2[9:4]	Y’3[9:2]
V4L2_PIX_FMT_Y10	‘Y10 ‘	Y’0[7:0]	000000 Y’0[9:8]	...	...	...
V4L2_PIX_FMT_Y10BPACK	‘Y10B’	Y’0[9:2]	Y’0[1:0] Y’1[9:4]	Y’1[3:0] Y’2[9:6]	Y’2[5:0] Y’3[9:8]	Y’3[7:0]
V4L2_PIX_FMT_Y10P	‘Y10P’	Y’0[9:2]	Y’1[9:2]	Y’2[9:2]	Y’3[9:2]	Y’3[1:0] Y’2[1:0] Y’1[1:0] Y’0[1:0]
V4L2_PIX_FMT_Y12	‘Y12 ‘	Y’0[7:0]	0000 Y’0[11:8]	...	...	...
V4L2_PIX_FMT_Y012	‘Y012’	Y’0[3:0] 0000	Y’0[11:4]	...	...	...
V4L2_PIX_FMT_Y14	‘Y14 ‘	Y’0[7:0]	00 Y’0[13:8]	...	...	...
V4L2_PIX_FMT_Y16	‘Y16 ‘	Y’0[7:0]	Y’0[15:8]	...	...	...
V4L2_PIX_FMT_Y16_BE	‘Y16 ‘ | (1U << 31)	Y’0[15:8]	Y’0[7:0]	...	...	...

Note

For the Y16 and Y16_BE formats, the actual sampling precision may be lower than 16 bits. For example, 10 bits per pixel uses values in the range 0 to 1023. For the IPU3_Y10 format 25 pixels are packed into 32 bytes, which leaves the 6 most significant bits of the last byte padded with 0.

For Y012 and Y12 formats, Y012 places its data in the 12 high bits, with padding zeros in the 4 low bits, in contrast to the Y12 format, which has its padding located in the most significant bits of the 16 bit word.