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I'm working with many GIS applications under Gnome. It sometimes is very convenient to place one map over another to quickly spot differences.

There used to be a KDE trick to make any window (not just a terminal!) transparent, thereby allowing me to make one map semi-transparent and place it on the window of the other mapping software. Is there a similar trick for Gnome?

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3 Answers 3

up vote 7 down vote accepted

I am not sure about Gnomw itself, but in Compiz, there is a plugin called "Opacity, Brightness and Saturation adjustments", which allows you control transparency of windows any way I can imagine, including Alt + {sroll} as Andrea Lazzarotto said.

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+1, acc for pointing out the plugin name. –  Adam Matan Aug 5 '10 at 12:48
Also, make sure you enable Animations, found under Effects. –  earthmeLon Jun 28 '11 at 2:41

Hold down the Alt key and then scroll with your mouse wheel.

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For newer versions of Gnome (Gnome 3/Gnome Shell), you can use this extension to make windows transparent:

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