Hello everybody:
I'm sure you like to capture images the most easy way with easy os.
By default, PAINT is installed in your system, so, why don't use it to capture and configure a key to do it?
I configured F1 to capture, all you must do is:
1.- Start EasyJWM
2.- Set JWM Keyboard Shortcuts
3.- Add New Shortcut
4.- KEY F1
5.- Action exec:mtpaint -s
APPLY AND NOW your F1 key is going to capture the screen.