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There is little point in trying to make it so that images cannot be copied. The fact that they show up on a web browser means that they have already been downloaded! How else would a computer show them? Getting the download process to put the image into a file is just a matter of how adept the user is.
That said, there are some things that help, and some things you just have to accept. If you put your image on the Internet it can be copied, and probably will be. So the idea then is to limit what can be done with it. Use the smallest resolution that will accomplish your need to begin with. Hence a 200x200 thumbnail sized image is often appropriate. And if the picture itself is what you want to display, don't make it any larger than 800x600. That is enough to allow decent computer display, but with most images will prevent making a decent print. If you want to have an exceptionally good computer display, go as high as 1024x768, but never any higher. At that resolution it can be used for other things though...
In addition, post only JPEG formatted images, and use excessively high compression when making the copy you post. Different programs have different ways to designate how much compression is used, with some measuring it as 0 to 100, others 1 to 12, and hard to say what else. Start with low numbers (say 50% or 6 for the 1-12 scale), and determine the lowest value that produces a usable image for your purposes. The result will be that trying to scale it to a higher resolution (a larger image) will enhance all of the really ugly JPEG artifacts!
The ultimate point though has to be that if you put it on the Internet it can be stolen. So do not post anything that you cannot live with having distributed or made into wall paper or whatever. (It's sort of like legal advice to never say anything on a telephone that you cannot live with seeing on the front page of tomorrow's newspaper!)
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