I simply zoom in on whatever picture and then use the windows screen grab tool by holding down the [shift] and [windows] key and then pressing the [s]-key.
this will darken the screen and turn the mouse pointer into a cross with which you can identify a rectangle: you go to any of the corners of the rectangle area you want to grab, hold the main mouse button down (left mouse button for most users), drag your mouse to the diagonally opposite corner, release the mouse button, et voila: that rectangle has been copied to your clipboard…
then you go to the application you want to paste the image into, and you are done…