When I took a screenshot using
mate-screenshot, I found a glare of Compiz window close effect on the picture.
This effect should not be shown for
mate-screenshot window. To config as so, do
$ ccsm (known as CompizConfig Settings Manager), and go to
& !(name=mate-screenshot) to
Window Match. If you are a
gnome-screenshot use, please read
gnome-screenshot as necessary.