Both Chromapure and Calman recommend to use a black pluge pattern to set brightness. I have tried to do this, but I found this method erratic and in the end, I kept wondering if I had the right setting.
The point of having a meter is to calibrate by measurement.
So I wondered if I could do it by measurement. I tried the following on a Samsung 55ES8000 using a Display2. My Display2 is 2years old and might not be accurate, but the point I want to show is that I want to detect when there is a change in Luminance, and this the Display2 can do.
Following are the measurements as average of 5 readings, at IRE 0%, 1%, 2%, 3% and 4%. Brightness settings are 43, 44, 45, 46, 47 and 48. Luminance is in cd/m2.
My observations are:
At brightness setting 44 or lower, the luminance at 1% is the same as at 0%. Blacks are crushed so setting is too low.
At brightness setting 47 or higher, the minimum black level MLL at 0% starts to go up. As I want lowest MLL, this brightness setting is too high.
So my conclusion is that I have to set brightness at 45 or 46. In order to select between the two values, I would use a visual obervation of a pluge, or calculate gamma (with MLL offset).
Please note that making this graph took quite some time. But that was only done for this thread. For setting brightness in a calibration, all it needs are a few measurements at near black.
My questions are:
- is this a reasonable method?
- is it more reliable than a pluge method?