desaturation http://www.adorama.com/alc/taginfo/desaturation Article: Partial Desaturation for Hand-Colored Look.Create the illusion of a hand-colored print in Photoshop <p><span style="font-size: small;">Black-and-white prints that have been hand-colored have an unmistakable appearance. Because there is a complete grayscale image underneath the pigment, these pictures have a sort of "image infrastructure" that exists nowhere else.</span></p> http://www.adorama.com/alc/article/8371