I just tested this with Ksnapshot on Slackware 14.2 with the Fluxbox window manager.
1. Start Ksnapshot (it will automatically take a screenshot on start up).
2. Tell Ksnapshot to "Take a new snapshot."
3. When the snapshot dialog box opens, set a delay (I set it for about 120 seconds for testing purposes).
4. Click to "Take snapshot."
5. Click to open xscreensaver-demo (that's the name of the configuration dialog for xscreensaver, the only legitimate Linux screensaver--all others are derivatives).
6. Pick a screensaver and click "Preview."
7. Wait long enough. (On my system, there was a ding when the screenshot was captured.)
8. Save screenshot.
I know you can't do this with the GIMP because, when you tell GIMP to capture a screenshot, after a delay, if one is set, elapses, the GIMP still wants a mouse-click to trigger the capture. Whether you can do it with other capture routines I don't have any way of testing right now (by the way, in Plasma, Ksnapshot has been renamed "Spectacle" but it seems to work pretty much the same).
Last edited by frankbell; 12-23-2018 at 08:52 PM.
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