Maybe he wants white screen vs gray.. That way the whites are white and the colors are vivid. Grey is gonna dull it down a bit on colors. Grey is good if room has ambient light, but you get duller colors and off whites.
my jvc dla 4k upshift projector doesnt have any problems doing black onea 1.1 gain white screen by draper in a dark room.
my jvc dla 4k upshift projector doesnt have any problems doing black onea 1.1 gain white screen by draper in a dark room.