Large screenshots

In order to create a screenshot of a program with a virtually larger resolution change the resolution with xrandr as follows

  # set large screen 2560 is width and 10000 is the height
  xrandr --output HDMI-1 --rate 60 --mode 2560x1440 --panning 2560x10000
  # make screenshot and 
  # set back to normal
  xrandr --output HDMI-1 --rate 60 --mode 2560x1440 --panning 2560x1440