*sigh* here I go trying NOT to explain how to get 
at files and you mention the print screen 
function.  Most people I know who do code never 
bothered to think of printscreen

Oh, and as a fancel artist, yeah, watermarks are 
easy to get around (the image I did for Kari's 
prize was a calendar image that had 'HAPPY NEW 
YEARS' in big letters across a quarter of it but 
I reconstructed the manga drawing behind it 
easily...) but it's too much of a bother for most 
people to use small thumbnails and enlarge 'em, 
be it a screen cap or a cel image.