1 .. Permission is granted to copy, distribute and/or modify this
2 .. document under the terms of the GNU Free Documentation License,
3 .. Version 1.1 or any later version published by the Free Software
4 .. Foundation, with no Invariant Sections, no Front-Cover Texts
5 .. and no Back-Cover Texts. A copy of the license is included at
6 .. Documentation/media/uapi/fdl-appendix.rst.
8 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
16 YUV is the format native to TV broadcast and composite video signals. It
17 separates the brightness information (Y) from the color information (U
18 and V or Cb and Cr). The color information consists of red and blue
19 *color difference* signals, this way the green component can be
20 reconstructed by subtracting from the brightness component. See
21 :ref:`colorspaces` for conversion examples. YUV was chosen because
22 early television would only transmit brightness information. To add
23 color in a way compatible with existing receivers a new signal carrier
24 was added to transmit the color difference signals. Secondary in the YUV
25 format the U and V components usually have lower resolution than the Y
26 component. This is an analog video compression technique taking
27 advantage of a property of the human visual system, being more sensitive
28 to brightness information.