How to apply a dynamic background via Active Directory GPP

Posted on by Shaun Vermaak

This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display

Step 1 – Creating Backgrounds

Designing backgrounds are out of scope for this article but a few guidelines are listed below

 

Using information from https://en.wikipedia.org/wiki/Display_resolution we can conclude that we mainly need to cater for 16:9, 16:10, 4:3 and 5:4 aspect ratios with a maximum width of 7680px.

 

If the required background is mainly horizontal, use this guide to create four different versions of background image

ScreenResolutions.jpgAlternatively, if the image is mainly vertical, start with a 10 924px x 6144px
image and crop to create four different versions of background image

ScreenRatios.png

 

Step 2 – User Environmental Variables

After creating the four different versions of the background, we need a way to control which version of background is pushed to the computers.

 

Create four user environmental variable objects using GPO User Environmental Preferences

 

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4.pngHere is the values required to create the four entries

  • 16:9 – PrimaryScreenAspectRatio = 1.778
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1280′ and ScreenHeight=’720′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1600′ and ScreenHeight=’900′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1920′ and ScreenHeight=’1080′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’2560′ and ScreenHeight=’1440′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’3840′ and ScreenHeight=’2160′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’7680′ and ScreenHeight=’4320′
  • 16:10 PrimaryScreenAspectRatio = 1.6
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1280′ and ScreenHeight=’800′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1440′ and ScreenHeight=’900′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1680′ and ScreenHeight=’1050′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1920′ and ScreenHeight=’1200′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’2560′ and ScreenHeight=’1600′
  • 4:3 PrimaryScreenAspectRatio = 1.333
    • Select * from Win32_DesktopMonitor where ScreenWidth=’320′ and ScreenHeight=’200′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’640′ and ScreenHeight=’480′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’800′ and ScreenHeight=’600′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1024′ and ScreenHeight=’768′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1152′ and ScreenHeight=’864′
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1600′ and ScreenHeight=’1200′
  • 5:4 PrimaryScreenAspectRatio = 1.25
    • Select * from Win32_DesktopMonitor where ScreenWidth=’1280′ and ScreenHeight=’1024

A C# application can be deployed as an addition to the GPO User Environmental Variables Preference Items as a GPO User File Preference. This is useful on RDP sessions and Hyper-V consoles where the WMI objects are not populated properly.

 

using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SetXRes
{
    class Program
    {
        static void Main(string[] args)
        {

            double primaryScreenAspectRatio;
            Rectangle resolution = Screen.PrimaryScreen.Bounds;
            primaryScreenAspectRatio = Math.Round(((double)resolution.Width / (double)resolution.Height), 3);

            Console.WriteLine(resolution.Width);
            Console.WriteLine(resolution.Height);
            Console.WriteLine(primaryScreenAspectRatio.ToString().Replace(',', '.'));

            Environment.SetEnvironmentVariable("PrimaryScreenAspectRatio", primaryScreenAspectRatio.ToString().Replace(',','.'), EnvironmentVariableTarget.User);
        }
    }
}

 

 

Step 3 – Background File Deployment

Create four file objects using GPO User Files Preferences

 

Based on the User Environmental Variable set in the previous step, an appropriately ratioed background file will be pushed to computers

5.png
6.png
7.png
8.pngHere is the values required to create the four entries

  • 16:9 – Source file(s) \\YOURDOMAIN.com\NETLOGON\Backgrounds\16-9.PNG
    • the environment variable %PrimaryScreenAspectRatio% is 1.778
  • 16:10 Source file(s) \\YOURDOMAIN.com\NETLOGON\Backgrounds\16-10.PNG
    • the environment variable %PrimaryScreenAspectRatio% is 1.6
  • 4:3 16:10 Source file(s) \\YOURDOMAIN.com\NETLOGON\Backgrounds\4-3.PNG
    • the environment variable %PrimaryScreenAspectRatio% is 1.333
  • 5:4 16:10 Source file(s) \\YOURDOMAIN.com\NETLOGON\Backgrounds\5-4.PNG
    • the environment variable %PrimaryScreenAspectRatio% is 1.25

The target file for all of these entries is %AppDataDir%\Branding\Background\Background.png

Step 4 – Applying Background

Now for the easy bit, just configure the background %AppData%\Branding\Background\Background.png.

Because the background is dynamically assigned, it will always have the same path on the computers

 

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