I picked this idea up from the Big Picture. And it works. I bought a colour correcting filter from formatt.co.uk CC20R. 85mm square gel, cost £9. Stuck to the front of the projector with blu-tack; will try something more permanent later. This makes the picture pink, but reduces the brightness of the blacks significantly. To fix the pinkness, go into the service menu, and modify one of the custom colours as follows: Use a black & white movie (eg the early part of Pleasantville) as a reference. Crank the red gain up to 255. Increase the green and blue values until the picture looks OK ie black&white. Now, all you have to do is set brightness and contrast correctly, and away you go. Blacks are now only about 50% as bright as they were, and other colours all look OK.