/usr/share/help/C/system-admin-guide/desktop-background.page is in gnome-user-docs 3.28.1-0ubuntu1.
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xmlns:its="http://www.w3.org/2005/11/its"
type="topic" style="task"
id="desktop-background">
<info>
<link type="guide" xref="appearance" />
<revision pkgversion="3.11" date="2014-01-29" status="draft"/>
<revision pkgversion="3.14" date="2014-06-17" status="incomplete">
<desc>All prose and instructions are up to par. Extra info needs
to be provided on picture options, per comment below. --shaunm</desc>
</revision>
<credit type="author copyright">
<name>Matthias Clasen</name>
<email>matthias.clasen@gmail.com</email>
<years>2012</years>
</credit>
<credit type="editor">
<name>Jana Svarova</name>
<email>jana.svarova@gmail.com</email>
<years>2013</years>
</credit>
<credit type="editor">
<name>Petr Kovar</name>
<email>pknbe@volny.cz</email>
<years>2014</years>
</credit>
<credit type="editor">
<name>David King</name>
<email>davidk@gnome.org</email>
<years>2014</years>
</credit>
<credit type="editor">
<name>Ekaterina Gerasimova</name>
<email>kittykat3756@gmail.com</email>
<years>2014</years>
</credit>
<desc>Change the default desktop background for all users.</desc>
</info>
<title>Set custom background</title>
<p>You can change the default desktop background to one that you want to use.
For example, you may want to use a background with your company or university
logo instead of the default GNOME background.</p>
<steps>
<title>Set the default background</title>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-profile-user'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-profile-user-dir'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<item>
<p>Create the key file
<file>/etc/dconf/db/local.d/00-background</file> to provide
information for the <sys>local</sys> database.</p>
<listing>
<title><file>/etc/dconf/db/local.d/00-background</file></title>
<code>
# Specify the dconf path
[org/gnome/desktop/background]
# Specify the path to the desktop background image file
picture-uri='file:///usr/local/share/backgrounds/wallpaper.jpg'
# Specify one of the rendering options for the background image:
picture-options='scaled'
# Specify the left or top color when drawing gradients, or the solid color
primary-color='000000'
# Specify the right or bottom color when drawing gradients
secondary-color='FFFFFF'
</code>
</listing>
<comment>
<cite date="2014-06-18">shaunm</cite>
<p>Provide information about the different picture-options
values. Possibly also about when and how colors are used
and what the gradient does.</p>
</comment>
</item>
<item>
<p>To prevent the user from overriding these settings, create the file
<file>/etc/dconf/db/local.d/locks/background</file> with the following
content:</p>
<listing>
<title><file>/etc/dconf/db/local.d/locks/background</file></title>
<code>
# Lock desktop background settings
/org/gnome/desktop/background/picture-uri
/org/gnome/desktop/background/picture-options
/org/gnome/desktop/background/primary-color
/org/gnome/desktop/background/secondary-color
</code>
</listing>
</item>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-update'])"
xmlns="http://www.w3.org/2001/XInclude"/>
<include href="dconf-snippets.xml"
xpointer="xpointer(/*/*[@xml:id='dconf-logoutin'])"
xmlns="http://www.w3.org/2001/XInclude"/>
</steps>
</page>
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