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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _yuv-luma-only:
*****************
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'\ :sub:`x`\ [9:2] denotes bits 9 to 2 of the Y' value for pixel at column
`x`.
- `0` denotes padding bits set to 0.
.. raw:: latex
\scriptsize
.. tabularcolumns:: |p{3.6cm}|p{3.0cm}|p{1.3cm}|p{2.6cm}|p{1.3cm}|p{1.3cm}|p{1.3cm}|
.. flat-table:: Luma-Only Image Formats
:header-rows: 1
:stub-columns: 0
* - Identifier
- Code
- Byte 0
- Byte 1
- Byte 2
- Byte 3
- Byte 4
* .. _V4L2-PIX-FMT-GREY:
- ``V4L2_PIX_FMT_GREY``
- 'GREY'
- Y'\ :sub:`0`\ [7:0]
- ...
- ...
- ...
- ...
* .. _V4L2-PIX-FMT-IPU3-Y10:
- ``V4L2_PIX_FMT_IPU3_Y10``
- 'ip3y'
- Y'\ :sub:`0`\ [7:0]
- Y'\ :sub:`1`\ [5:0] Y'\ :sub:`0`\ [9:8]
- Y'\ :sub:`2`\ [3:0] Y'\ :sub:`1`\ [9:6]
- Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [9:4]
- Y'\ :sub:`3`\ [9:2]
* .. _V4L2-PIX-FMT-Y10:
- ``V4L2_PIX_FMT_Y10``
- 'Y10 '
- Y'\ :sub:`0`\ [7:0]
- `000000` Y'\ :sub:`0`\ [9:8]
- ...
- ...
- ...
* .. _V4L2-PIX-FMT-Y10BPACK:
- ``V4L2_PIX_FMT_Y10BPACK``
- 'Y10B'
- Y'\ :sub:`0`\ [9:2]
- Y'\ :sub:`0`\ [1:0] Y'\ :sub:`1`\ [9:4]
- Y'\ :sub:`1`\ [3:0] Y'\ :sub:`2`\ [9:6]
- Y'\ :sub:`2`\ [5:0] Y'\ :sub:`3`\ [9:8]
- Y'\ :sub:`3`\ [7:0]
* .. _V4L2-PIX-FMT-Y10P:
- ``V4L2_PIX_FMT_Y10P``
- 'Y10P'
- Y'\ :sub:`0`\ [9:2]
- Y'\ :sub:`1`\ [9:2]
- Y'\ :sub:`2`\ [9:2]
- Y'\ :sub:`3`\ [9:2]
- Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [1:0] Y'\ :sub:`1`\ [1:0] Y'\ :sub:`0`\ [1:0]
* .. _V4L2-PIX-FMT-Y12:
- ``V4L2_PIX_FMT_Y12``
- 'Y12 '
- Y'\ :sub:`0`\ [7:0]
- `0000` Y'\ :sub:`0`\ [11:8]
- ...
- ...
- ...
* .. _V4L2-PIX-FMT-Y012:
- ``V4L2_PIX_FMT_Y012``
- 'Y012'
- Y'\ :sub:`0`\ [3:0] `0000`
- Y'\ :sub:`0`\ [11:4]
- ...
- ...
- ...
* .. _V4L2-PIX-FMT-Y12P:
- ``V4L2_PIX_FMT_Y12P``
- 'Y12P'
- Y'\ :sub:`0`\ [11:4]
- Y'\ :sub:`1`\ [11:4]
- Y'\ :sub:`1`\ [3:0] Y'\ :sub:`0`\ [3:0]
- ...
- ...
* .. _V4L2-PIX-FMT-Y14:
- ``V4L2_PIX_FMT_Y14``
- 'Y14 '
- Y'\ :sub:`0`\ [7:0]
- `00` Y'\ :sub:`0`\ [13:8]
- ...
- ...
- ...
* .. _V4L2-PIX-FMT-Y16:
- ``V4L2_PIX_FMT_Y16``
- 'Y16 '
- Y'\ :sub:`0`\ [7:0]
- Y'\ :sub:`0`\ [15:8]
- ...
- ...
- ...
* .. _V4L2-PIX-FMT-Y16-BE:
- ``V4L2_PIX_FMT_Y16_BE``
- 'Y16 ' | (1U << 31)
- Y'\ :sub:`0`\ [15:8]
- Y'\ :sub:`0`\ [7:0]
- ...
- ...
- ...
.. raw:: latex
\normalsize
.. 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.
|
