I am printing photo greeting cards via Photoshop CS to my Phaser 8400. I generally get good color on color subjects, but when trying to print a black and white image (in color mode because I get better quality than using black and white setting) I am getting an image with a sepia cast. How can I adjust the distribution of ink in color mode to arrive at a "castless" true b & w image? Most of the attempts to eliminate it via Photoshop do absolutely nothing.