Sparky Screenshot is a Yad based GUI frontend for scrot tool, which lets you take a picture of your desktop or a selected window and save it on your local disk.
It was preinstalled (up to Sparky 3.6 & 4.0 RC) in Sparky editions: LXDE, LXQt, GameOver, Openbox and JWM. Starting from Sparky 4.0, Sparky Screenshot has been replaced by Gscreenshot.
Installation:
sudo apt-get install sparky-screenshot