I\'ve noticed that in Google Chrome, one can click and hold an image and while holding a semi-transparent copy of that image attaches itself with the cursor. Then one can dr
Another way is to create a transparent picture over the top of the picture you want to prevent viewing.
Please see: http://www.dwuser.com/education/content/stop-the-thieves-strategies-to-protect-your-images/
check under "Tricking the downloaders"