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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>YUV Formats</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="LINUX MEDIA INFRASTRUCTURE API" /><link rel="up" href="ch02.html" title="Chapter 2. Image Formats" /><link rel="prev" href="re05.html" title="V4L2_PIX_FMT_SBGGR16 ('BYR2')" /><link rel="next" href="re06.html" title="Packed YUV formats" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">YUV Formats</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re05.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Image Formats</th><td width="20%" align="right"> <a accesskey="n" href="re06.html">Next</a></td></tr></table><hr /></div><div class="section" title="YUV Formats"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="yuv-formats"></a>YUV Formats</h2></div></div></div><div class="toc"><dl><dt><span class="refentrytitle"><a href="re06.html">Packed YUV formats</a></span><span class="refpurpose"> — Packed YUV formats</span></dt><dt><span class="refentrytitle"><a href="re07.html">V4L2_PIX_FMT_GREY ('GREY')</a></span><span class="refpurpose"> — Grey-scale image</span></dt><dt><span class="refentrytitle"><a href="re08.html">V4L2_PIX_FMT_Y16 ('Y16 ')</a></span><span class="refpurpose"> — Grey-scale image</span></dt><dt><span class="refentrytitle"><a href="re09.html">V4L2_PIX_FMT_YUYV ('YUYV')</a></span><span class="refpurpose"> — Packed format with ½ horizontal chroma
resolution, also known as YUV 4:2:2</span></dt><dt><span class="refentrytitle"><a href="re10.html">V4L2_PIX_FMT_UYVY ('UYVY')</a></span><span class="refpurpose"> — Variation of
<code class="constant">V4L2_PIX_FMT_YUYV</code> with different order of samples
in memory</span></dt><dt><span class="refentrytitle"><a href="re11.html">V4L2_PIX_FMT_YVYU ('YVYU')</a></span><span class="refpurpose"> — Variation of
<code class="constant">V4L2_PIX_FMT_YUYV</code> with different order of samples
in memory</span></dt><dt><span class="refentrytitle"><a href="re12.html">V4L2_PIX_FMT_VYUY ('VYUY')</a></span><span class="refpurpose"> — Variation of
<code class="constant">V4L2_PIX_FMT_YUYV</code> with different order of samples
in memory</span></dt><dt><span class="refentrytitle"><a href="re13.html">V4L2_PIX_FMT_Y41P ('Y41P')</a></span><span class="refpurpose"> — Format with ¼ horizontal chroma
resolution, also known as YUV 4:1:1</span></dt><dt><span class="refentrytitle"><a href="re14.html">V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')</a></span><span class="refpurpose"> — Planar formats with ½ horizontal and
vertical chroma resolution, also known as YUV 4:2:0</span></dt><dt><span class="refentrytitle"><a href="re15.html">V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')</a></span><span class="refpurpose"> — Planar formats with ¼ horizontal and
vertical chroma resolution, also known as YUV 4:1:0</span></dt><dt><span class="refentrytitle"><a href="re16.html">V4L2_PIX_FMT_YUV422P ('422P')</a></span><span class="refpurpose"> — Format with ½ horizontal chroma resolution,
also known as YUV 4:2:2. Planar layout as opposed to
<code class="constant">V4L2_PIX_FMT_YUYV</code></span></dt><dt><span class="refentrytitle"><a href="re17.html">V4L2_PIX_FMT_YUV411P ('411P')</a></span><span class="refpurpose"> — Format with ¼ horizontal chroma resolution,
also known as YUV 4:1:1. Planar layout as opposed to
<code class="constant">V4L2_PIX_FMT_Y41P</code></span></dt><dt><span class="refentrytitle"><a href="re18.html">V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')</a></span><span class="refpurpose"> — Formats with ½ horizontal and vertical
chroma resolution, also known as YUV 4:2:0. One luminance and one
chrominance plane with alternating chroma samples as opposed to
<code class="constant">V4L2_PIX_FMT_YVU420</code></span></dt><dt><span class="refentrytitle"><a href="re19.html">V4L2_PIX_FMT_NV16 ('NV16'), V4L2_PIX_FMT_NV61 ('NV61')</a></span><span class="refpurpose"> — Formats with ½ horizontal
chroma resolution, also known as YUV 4:2:2. One luminance and one
chrominance plane with alternating chroma samples as opposed to
<code class="constant">V4L2_PIX_FMT_YVU420</code></span></dt></dl></div><p>YUV is the format native to TV broadcast and composite video
signals. It separates the brightness information (Y) from the color
information (U and V or Cb and Cr). The color information consists of
red and blue <span class="emphasis"><em>color difference</em></span> signals, this way
the green component can be reconstructed by subtracting from the
brightness component. See <a class="xref" href="ch02s02.html" title="Colorspaces">the section called “Colorspaces”</a> for conversion
examples. YUV was chosen because early television would only transmit
brightness information. To add color in a way compatible with existing
receivers a new signal carrier was added to transmit the color
difference signals. Secondary in the YUV format the U and V components
usually have lower resolution than the Y component. This is an analog
video compression technique taking advantage of a property of the
human visual system, being more sensitive to brightness
information.</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re05.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re06.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">V4L2_PIX_FMT_SBGGR16 ('BYR2') </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Packed YUV formats</td></tr></table></div></body></html>
