korravai if i can give you a piece of advice for your scan, there is an option in fotoshop called "levels". i wint tell you where to find it since i dont know the english names of fotoshop.
http://myphotoshopbrushes.com/_images/tutorial/levels1.jpg
but once you are there, you can set the white balance by clicking on apart of the sheet that is supposed to be white (the COVERGIRL letters for xple)
you have 3 buttons in the level panel, a black eyedropper, a grey one and a white one. just click on the white one and click on a white pixel on your pic.
TA DAAA !! :Dinah:
(dont use the black eyedrop after that since it can messup the whole thing. increase the black level anually instead.)