Originally Posted by richlo
so in effect, this will mean that right now leaving at 0-255 will give me incorrect readings?? man, here we go again, time to go over my calibration..
Not so much a matter of incorrect readings, but incorrect settings.
For video playback anything below digital 16 = reference black = 0% stimulus should be off. By setting your range to 0-255, digital 16 isn't black it's very dark grey which means your overall image will be too bright for movies. However it will be fine for pictures, etc.
Don't forget that calibration is an N-step, iterative process. You need to set brightness/contrast first, measure greyscale and colour and make adjustments, then re-check and perhaps adjust brightness and contrast, etc.
It's possible to have perfect greyscale, but with incorrect levels.