I bought a new TV a few days back, and I thought I might calibrate it, as the image is darker and less colourful than my previous TV. In the past I've just messed about with the usual options (colour, contrast, brightness, etc) on a TV until it looked OK, but it might be interesting to actually do it properly, so can anyone recommend a good guide, or a good (and hopefully free) calibration disc, or whateve, please?