locate (or create) the following file and disable the read permissions
/data/data/com.cooliris.media/files/zzzzzz_lockscreen_wallpaper.jpg(to locate/create and edit the above file permissions use a
file manager app able to navigate the /data folder.
NOTE: Manual edit of files in /data/folder require root permissions so the Andriod system must be rooted first
NOTE2:
This trick works on Samsung Galaxy Y stock ROM, on which the system looks for the file zzzzzz_lockscreen_wallpaper.jpg located in /data/data/com.cooliris.media/files to be used as lockscreen wallpaper. Other ROMs might look for different filename and/or different location.)
That's it! :D
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As side note I want to add that my first read about this topic was, about two weeks ago, a thread started by XDA member recognized contributor
marcussmith2626 more than one year ago (
How To Make The Lockscreen Transparent) which explains a more sophisticated way to get the lockscreen transparent and that might work on a variety of ROM and devices.
Then I accidentally discovered the above trick by my own (I forgot to set the permissions after replacing the jpg file) and I decided to share it here even though I don't know if anyone had posted the same trick before as comment at the marcussmith2626 thread or anywhere else in XDA or the Internet virtual space ;)