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Change the login window background picture - revisited
Authored by: hints_hinterton on Sep 30, '11 03:25:13PM

Original terminal tip worked for me under 10.5.8 although not at first.
I did
[code]sudo defaults write /Library/Preferences/ DesktopPicture '/path/to/replacement/image/file.jpg'[/code]

You do need the quotation marks around your file path.
I don't know if you need to pre-size your image to 2560x1600@72dpi but that's what the default image is.

I think what finally did the trick was setting the permissions on both the image and enclosing directory to be world/group/other readable. You don't really want to muck with permissions on a system level folder but if it's your own creation, it should be alright. You should be able to use the Get Info permissions area to take care of this. For the Terminal savvy, I assigned both image and directory to be owned by root:admin, set directory to 775 and image to 644 but I'm sure other combinations will work.

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