Question about "Transparent" option of xfdesktop

[Masato Hashimoto]

Hi.

I have a question about "Transparent" option of xfdesktop (trunk).
What kind of behavior does the option do?

xfdesktop manual describes:
 The "Transparent" option, when you use a colored background without backdrop image, 
 allows you to see the windows that are under the transparent desktop window. 
 This requires an activated compositor.

Where is *under* the transparent desktop window?

I tried as follows:
 * Enable display compositing (Window Manager Tweaks)
 * Desktop settings -> Image: none
 * Desktop settings -> Color: Transparent

I could recognize only a difference of the brightness of the desktop.

Regards.
-- 
HASHIMOTO, Masato
cabezon.hashimoto at gmail.com