It bugged me for a long time that the user pictures in the login window would not respect a user picture's transparency mask, but draw the icon on a white square instead. Luckily I found out how to get rid of this in Mac OS X 10.5! As this solution requires the use of Terminal, the usual "use at your own risk" applies.Leopard stores the cache where it keeps the user pictures accessible via the command line utility dscl. Let's assume the user account whose picture we want to change is called steve. (Obviously, replace steve with the short name of your account in the following commands). Type the following into the terminal:dscl . -read /Users/steve PictureThis should give output like this, reflecting your currently-selected image:Picture: /Library/User Pictures/Animals/Butterfly.tif There is also an entry i...

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