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Dir : ~/usr/share/help/C/system-admin-guide/

Edit File: desktop-background.page

<info>
 <link type="guide" xref="appearance" />
 <link type="seealso" xref="backgrounds-extra" />
 <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>

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.

<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>
 Create the key file
 <file>/etc/dconf/db/local.d/00-background</file> to provide
 information for the <sys>local</sys> database.
 <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>
	Provide information about the different picture-options
	values. Possibly also about when and how colors are used
	and what the gradient does.
 </comment>
 </item>
 <item>
 To prevent the user from overriding these settings, create the file
 <file>/etc/dconf/db/local.d/locks/background</file> with the following
 content:
 <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>