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<page xmlns="http://projectmallard.org/1.0/" type="topic" style="question" id="color-notspecifiededid" xml:lang="ja">

  <info>
    <link type="guide" xref="color#problems"/>
    <link type="guide" xref="color-gettingprofiles"/>
    <link type="guide" xref="color-why-calibrate"/>
    <desc>Default monitor profiles do not have a calibration date.</desc>
    <credit type="author">
      <name>Richard Hughes</name>
      <email>richard@hughsie.com</email>
    </credit>
    <include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>松澤 二郎</mal:name>
      <mal:email>jmatsuzawa@gnome.org</mal:email>
      <mal:years>2011, 2012, 2013, 2014, 2015</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>赤星 柔充</mal:name>
      <mal:email>yasumichi@vinelinux.org</mal:email>
      <mal:years>2011, 2012</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Kentaro KAZUHAMA</mal:name>
      <mal:email>kazken3@gmail.com</mal:email>
      <mal:years>2012</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Shushi Kurose</mal:name>
      <mal:email>md81bird@hitaki.net</mal:email>
      <mal:years>2012</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Noriko Mizumoto</mal:name>
      <mal:email>noriko@fedoraproject.org</mal:email>
      <mal:years>2013, 2014</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>坂本 貴史</mal:name>
      <mal:email>o-takashi@sakamocchi.jp</mal:email>
      <mal:years>2013, 2014</mal:years>
    </mal:credit>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>日本GNOMEユーザー会</mal:name>
      <mal:email>http://www.gnome.gr.jp/</mal:email>
      <mal:years>2011, 2012</mal:years>
    </mal:credit>
  </info>

  <title>Why don’t the default monitor profiles have a calibration expiry?</title>
  <p>
    The default color profile used for each monitor is generated
    automatically based on the display 
    <link href="https://en.wikipedia.org/wiki/Extended_Display_Identification_Data">
    EDID</link> which is stored in a memory chip inside the monitor.
    The EDID only gives us a snapshot of the available colors the monitor
    was capable of displaying when it was manufactured, and does not
    contain much other information for color correction.
  </p>

  <figure>
    <desc>As the EDID cannot be updated, it has no expiry date.</desc>
    <media type="image" mime="image/png" src="figures/color-profile-default.png"/>
  </figure>

  <note style="tip">
    <p>
      Getting a profile from the monitor vendor or creating a profile
      yourself would lead to more accurate color correction.
    </p>
  </note>

</page>