Nifty Panel/Image Slightly Transparent

How do you make a panel or image slightly transparent?

For panels you have the background color attribute. Just add some alpha. You should get the 1.3.2 manual:
http://sourceforge.net/projects/nifty-gui/files/nifty-gui/1.3.2/nifty-gui-the-manual-1.3.2.pdf/download

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