Since I cannot print screen (or screen capture) the output of xscreensaver (there are some very nice graphics!), how can I redirect the output of xscreensaver to a PNG file, using the command-line?

I want to "grab" some images as wallpapers. I want to use command-line because this way I can select programatically which xscreensaver display mode I want.

Also I need the output to be as wide as my screen (1920x1080).

Is this possible? If so, how do I accomplish?

I tried redirecting the output but I failed miserably.

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