yep, just like that.
Hit the print screen key wen you have a nice situation that you wanna inmortalice ;D then press Tab+Alt in the same time and you game will be minimazed( If you don't go lots of RAM just exit the game,it will be ok) then open your favourite image editing program( I use the standart one, Paint) and go to the top of the window where it says "Edit", hit it and then wen the drop down menu apears click on paste, and there you go, your pic.
You can change the size of the pic if you'll like by going to "Image" on top of the window next to "Edit", in there you'll find diferent options, like "Flip-Rotate", "stretch-Squew", etc, well the one you want is stretch squew, and wen you save it try to save it in JPEG format, it takes a lot less space in the folder for your addons or missions.
I hoppe this helps.
Later all.
@CERO.