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.