At work, I'm often faced with shooting white apparel on a white seamless. I usually just lower the exposure to darken the whole image and then rely on the photo editors to fix skin tones, etc. Is there a better way? I can't change the seamless and placing a different color foam core board behind the model is not practical in this fast paced environment. In the studio I use two 500 watt strobes; silver umbrella at 3/4 angle, vertical soft box (28x42) directly behind me so that my head is partially blocking it, usually set at about 250 watts or alternating 250/125. Canon 5D at 1/160, F11 - F13, ISO 160-200, 24-105mm lens. Thanks!!