Can anyone explain how to set the contrast with this disc? It has a series of vertical boxes in shades of white to gray. The narrator talks about "blooming", but I don't understand the instructions. Do I set it to where the top 2 boxes blend into 1? I have an X1 projector and am using 2 different inputs for my DVD player and HD satellite. Do I need to calibrate both inputs separately? Thanks for any advice.