Select area and make a screenshot after 2 seconds
scrot -s -b -d 2 ~/abc/abc.png
Thumbnail quality 85% 20% size
scrot -q 85 -t 20 ~/abc/abc.png
Create screenshot and open Gimp
scrot abc.png -e 'gimp $f'
-s --select -u --focused window -b --border window -d --delay -c --count delay -q --quality