Change the Login Screen Wallpaper in OS X Lion

This is a discussion on Change the Login Screen Wallpaper in OS X Lion within the OS X How-To's, Tutorials, Tips & Tricks forums, part of the Mac OS X category; Here’s how to change the wallpaper that lies behind the standard login screen on OS X Lion (although not the login background you see if ...

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    Change the Login Screen Wallpaper in OS X Lion



    Here’s how to change the wallpaper that lies behind the standard login screen on OS X Lion (although not the login background you see if you have FileVault enabled, which cannot be altered). As such, this tweak is not for the fainthearted because it involves editing system files and will therefore affect all users of the system. Previous tips here at OSXDaily have explained how to change the login screen background in prior versions of OS X, but OS X Lion changed everything (again).

    For OS X Lion, the file we need to replace is called
    NSTexturedFullScreenBackgroundColor.png
    and is located at:

    /System/Library/Frameworks/AppKit.framework/Versions/C/Resources/

    As with the Mission Control and Dashboard wallpapers, the login screen wallpaper is actually a pattern that’s repeated from left to right, top to bottom. You can replace it with a similar pattern of the same size (256 x 256 pixels) or use a full-size image the exact same resolution as your monitor.

    Note that because the white text and graphics of the login screen are overlaid on the wallpaper, darker wallpapers tend to work better than light ones.

    How to Replace the Login Screen Wallpaper in Mac OS X Lion

    Open the image you’d like to use for the wallpaper in Preview and convert it to PNG format by clicking File -> Export. In the dialog box that appears, select PNG from the Format dropdown list and change the filename so it reads “NSTexturedFullScreenBackgroundColor.png”.
    Back up the original wallpaper image by opening a Finder window, hitting Shift+Command+G and typing the following path:
    /System/Library/Frameworks/AppKit.framework/Versions/C/Resources/

    Now copy the “NSTexturedFullScreenBackgroundColor.png” file to a safe backup location.

    Then click and drag your new image onto the Finder window so it overwrites the original. You’ll be asked to authenticate, so click the button in the dialog box that appears and type your login password when prompted. Choose to replace the original file when prompted.

    That’s all that’s required, but you’ll have to reboot your computer for the change to take effect.

    If you find the wallpaper pattern shrunk and repeated across the login screen rather than filling it, try using an image editor to create a new image of the same resolution as your screen (that is, 1280 x 800, for example), and then open your wallpaper image before copying and pasting it into the new image. Then save out the new image to the location mentioned earlier using the filename that’s mentioned.

    To revert to the default login wallpaper, repeat the steps above to browse back to:

    /System/Library/Frameworks/AppKit.framework/Versions/C/Resources/

    And drop your backup “NSTexturedFullScreenBackgroundColor.png” image back in place.

    12-2-11

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