Very often I want to remove the white backgound from images I buy and put them on another colour or save as transparent.

I have used the magic wand to remove the white but i always find that around the edges there is a little whitever pale gray whcih then makes them look poor quality - especially if Im going to reuse on a dark background. Also sometimes the background is not just around the outside, it goes in and out of the image (as an example I just bought an ornate scroll to edge a website and the white is in every nook and crany).

Please help - Im sure there must be an easy way to do this but I cant find it in the help files.