<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" style="task" id="color-testing" xml:lang="pa">

  <info>

    <link type="guide" xref="color#problems"/>

    <link type="seealso" xref="color-gettingprofiles"/>

    <revision pkgversion="3.7.1" version="0.2" date="2012-11-16" status="outdated"/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>Ekaterina Gerasimova</name>

      <email>kittykat3756@gmail.com</email>

    </credit>

    <credit type="editor">

      <name>Michael Hill</name>

      <email>mdhillca@gmail.com</email>

    </credit>

    <include xmlns="http://www.w3.org/2001/XInclude" href="legal.xml"/>

    <desc>Use the supplied test profiles to check that your profiles are being

    applied correctly to your screen.</desc>

  </info>

  <title>How do I test if color management is working correctly?</title>

  
The effects of a color profile are sometimes subtle and it may be hard to

  see if anything much has changed.

  
GNOME comes with several profiles for testing that make it very clear when

  the profiles are being applied:

  <terms>

    <item>

      <title>Blue</title>

      
This will turn the screen blue and tests if the calibration curves are

      being sent to the display.

    </item>

      <title>ADOBEGAMMA-test</title>

      
This will turn the screen pink and tests different features of a

      screen profile.

    </item>

    <item>

      <title>FakeBRG</title>

      
This will not change the screen, but will swap around the RGB channels

      to become BGR. This will make all the colors gradients look mostly

      correct, and there won’t be much difference on the whole screen, but

      images will look very different in applications that support color

      management.

    </item>-->

  </terms>

  <steps>

    <item>

      
Open the <gui xref="shell-introduction#activities">Activities</gui> overview and

      start typing <gui>Settings</gui>.

    </item>

    <item>

      
Click on <gui>Settings</gui>.

    </item>

    <item>

      
Click <gui>Devices</gui> in the sidebar.

    </item>

    <item>

      
Click <gui>Color</gui> in the sidebar to open the panel.

    </item>

    <item>

      
Select the device for which you want to add a profile. You may wish to

      make a note of which profile is currently being used.

    </item>

    <item>

      
Click <gui>Add profile</gui> to select a test profile, which should be

      at the bottom of the list.

    </item>

    <item>

      
Press <gui>Add</gui> to confirm your selection.

    </item>

    <item>

      
To revert to your previous profile, select the device in the

      <gui>Color</gui> panel, then select the profile that you were using

      before you tried one of the test profiles and press <gui>Enable</gui> to

      use it again.

    </item>

  </steps>

  
Using these profiles, you can clearly see when an application supports

  color management.

</page>