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Re: Image protection
A screen-grab will have perfect image quality. All the user will need to do is crop it accurately and then compress it to a jpg, png or gif as appropriate and they will have a file as good as your original. If you can display it then there is always a way to save it.
This is why I didn't bother to hard to protect my images. Instead, I concentrated on deceiving any mischevious user into thinking they have the image when, in fact, they haven't. I use something like the overlaying technique described by Matth. Unless there is a package that can do this for you, I imagine that dicing will take a long time.
One other way I have noticed, is to convert the image into a Flash movie. These cannot be saved using a right-click but again they can be screen-grabbed.
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