Sure it is possible. I don't use photoshop, but ANY decent photo editing software will allow you to change and modify pixel by pixel usually with a tool. You will need to edit the image to do this in some type of a toolbox.

The suggestion in the above post is a quick and easy way to do the same thing. Also in the general html IMG command there is a BORDER sub tag. Ussualy set to border="0" Try adding border="1" and see what happens....

format: <img src="http://xxxxx.xxx" border="1"> </img>