Try this, do a Google search, when on the results page, right click on the Google logo and select "View Image"....do you get the Google logo or is it like the image I see (below)? Weird! Is this some sort of image protection?
Right you are...Here's an explanation: http://www.darrinward.com/articles/google/Google-SERP-Image-Optimization
You can use CSS you simply input the x and y positions of the image you want to extract from the main image.