Posted on August 30, 2016 · Posted in Windows 10

How to Disable Wallpaper JPEG Compression in Windows 10

Some  Windows 10 users could notice that when setting a JPEG image as the desktop wallpaper, the quality of the wallpaper is reduced in compared to the original image. The number of image artifacts has increased and is more obvious on large screens. The problem is not new, and could be observed in Windows 7 or Windows 8, with the image quality reduced by 15%. But only in Windows 10 you can now manage such system behavior.

When setting a JPEG image as a wallpaper, Windows automatically reduces its quality to 85%. Consequently, the size of the file is also reduced. This is done to reduce the size of allocated memory for the wallpaper and to save space on the disk. Thus, Microsoft tries to reach an optimal compromise between the image quality, the image size and the system performance.

The system stores the converted image in a file named  TranscodedWallpaper inside the directory C:\Users\%username%\AppData\Roaming\Microsoft\Windows\Themes\. If you change the extension of this file to *.jpg, you can view the image used as the wallpaper.

windows 10 - File Transcoded reduce wallpaper jpeg quality


You can manage the image compression level  only through the registry.

  • Open the Registry Editor (regedit.exe)
  • Go to HKEY_CURRENT_USER\Control Panel\Desktop
  • Create a new 32-bit DWORD parameter with the name JPEGImportQuality
  • The value of this parameter is between 60 and 100 (in the decimal system). The value of 100 means using the highest-quality wallpaper (without compression). By default, the system  uses the value of 85.JPEGImportQuality - registry key
  • Log off the system.
  • After you log on again, set the image you need as a wallpaper. It has to be displayed without compression.

Note. In Windows 7/8, this registry key will not work. As a workaround, you can substitute TranscodedWallpaper with the original image file (100% quality). Also you have to replace this file in CachedFiles folder. The size of the wallpaper file can be determined by its name, in which the current screen resolution has to be indicated, e. g., CachedImage_1280_1024_POS4.jpg.

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