/usr/share/help/hi/gnome-help/color-calibrate-screen.page is in gnome-user-docs-hi 3.28.1-0ubuntu1.
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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="task" id="color-calibrate-screen" xml:lang="hi">
<info>
<link type="guide" xref="color#calibration"/>
<link type="seealso" xref="color-calibrate-printer"/>
<link type="seealso" xref="color-calibrate-scanner"/>
<link type="seealso" xref="color-calibrate-camera"/>
<revision pkgversion="3.7.1" version="0.2" date="2012-11-16" status="outdated"/>
<revision pkgversion="3.10" date="2013-11-04" status="candidate"/>
<revision pkgversion="3.28" date="2018-04-05" status="review"/>
<credit type="author">
<name>Richard Hughes</name>
<email>richard@hughsie.com</email>
</credit>
<credit type="editor">
<name>Michael Hill</name>
<email>mdhillca@gmail.com</email>
</credit>
<credit type="editor">
<name>Ekaterina Gerasimova</name>
<email>kittykat3756@gmail.com</email>
</credit>
<include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>
<desc>Calibrating your screen is important to display accurate
colors.</desc>
</info>
<title>How do I calibrate my screen?</title>
<p>You can calibrate your screen so that it shows more accurate color. This
is especially useful if you are involved in digital photography, design or
artwork.</p>
<p>You will need either a colorimeter or a spectrophotometer to do this. Both
devices are used to profile screens, but they work in slightly different
ways.</p>
<steps>
<item>
<p>Make sure your calibration device is connected to your computer.</p>
</item>
<item>
<p>Open the <gui xref="shell-introduction#activities">Activities</gui> overview and
start typing <gui>Settings</gui>.</p>
</item>
<item>
<p>Click on <gui>Settings</gui>.</p>
</item>
<item>
<p>Click <gui>Devices</gui> in the sidebar.</p>
</item>
<item>
<p>Click <gui>Color</gui> in the sidebar to open the panel.</p>
</item>
<item>
<p>Select your screen.</p>
</item>
<item>
<p>Press <gui style="button">Calibrate…</gui> to commence the
calibration.</p>
</item>
</steps>
<p>Screens change all the time: the backlight in a TFT display will halve in
brightness approximately every 18 months, and will get yellower as it gets
older. This means you should recalibrate your screen when the [!] icon
appears in the <gui>Color</gui> panel.</p>
<p>LED screens also change over time, but a much slower rate than TFTs.</p>
</page>
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