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 colum x.
- 0 denotes padding bits set to 0.
| Identifier | Code | Byte 0 | Byte 1 | Byte 2 | Byte 3 | Byte 4 |
|---|---|---|---|---|---|---|
V4L2_PIX_FMT_GREY |
‘GREY’ | Y’0[7:0] | … | … | … | … |
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[7:0] | Y’1[9:8] | 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_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.