Documentation/DocBook/v4l/pixfmt-grey.xml

   1     <refentry id="V4L2-PIX-FMT-GREY">
   2       <refmeta>
   3         <refentrytitle>V4L2_PIX_FMT_GREY ('GREY')</refentrytitle>
   4         &manvol;
   5       </refmeta>
   6       <refnamediv>
   7         <refname><constant>V4L2_PIX_FMT_GREY</constant></refname>
   8         <refpurpose>Grey-scale image</refpurpose>
   9       </refnamediv>
  10       <refsect1>
  11         <title>Description</title>
  12
  13         <para>This is a grey-scale image. It is really a degenerate
  14 Y'CbCr format which simply contains no Cb or Cr data.</para>
  15
  16         <example>
  17           <title><constant>V4L2_PIX_FMT_GREY</constant> 4 &times; 4
  18 pixel image</title>
  19
  20           <formalpara>
  21             <title>Byte Order.</title>
  22             <para>Each cell is one byte.
  23                 <informaltable frame="none">
  24                 <tgroup cols="5" align="center">
  25                   <colspec align="left" colwidth="2*" />
  26                   <tbody valign="top">
  27                     <row>
  28                       <entry>start&nbsp;+&nbsp;0:</entry>
  29                       <entry>Y'<subscript>00</subscript></entry>
  30                       <entry>Y'<subscript>01</subscript></entry>
  31                       <entry>Y'<subscript>02</subscript></entry>
  32                       <entry>Y'<subscript>03</subscript></entry>
  33                     </row>
  34                     <row>
  35                       <entry>start&nbsp;+&nbsp;4:</entry>
  36                       <entry>Y'<subscript>10</subscript></entry>
  37                       <entry>Y'<subscript>11</subscript></entry>
  38                       <entry>Y'<subscript>12</subscript></entry>
  39                       <entry>Y'<subscript>13</subscript></entry>
  40                     </row>
  41                     <row>
  42                       <entry>start&nbsp;+&nbsp;8:</entry>
  43                       <entry>Y'<subscript>20</subscript></entry>
  44                       <entry>Y'<subscript>21</subscript></entry>
  45                       <entry>Y'<subscript>22</subscript></entry>
  46                       <entry>Y'<subscript>23</subscript></entry>
  47                     </row>
  48                     <row>
  49                       <entry>start&nbsp;+&nbsp;12:</entry>
  50                       <entry>Y'<subscript>30</subscript></entry>
  51                       <entry>Y'<subscript>31</subscript></entry>
  52                       <entry>Y'<subscript>32</subscript></entry>
  53                       <entry>Y'<subscript>33</subscript></entry>
  54                     </row>
  55                   </tbody>
  56                 </tgroup>
  57                 </informaltable>
  58               </para>
  59           </formalpara>
  60         </example>
  61       </refsect1>
  62     </refentry>
  63
  64   <!--
  65 Local Variables:
  66 mode: sgml
  67 sgml-parent-document: "pixfmt.sgml"
  68 indent-tabs-mode: nil
  69 End:
  70   -->