alex_t:
Finally, I did a probe profile with both probes turned to the screen. As I saw that there are 2 different ways to make a probe profile (with a lot of expert's discussions), I have decided to try both : I mean RGBW at 100% versus RGBW at 75%.What is your opinion ?
Hello Alex,
It doesn't matter if you have a JETI / Photo Reaseach / Minolta.... but If you have i1PRO 1/2: these meters are returning chromaticity but they are not so accurate reading low luminance levels, for example Blue Pattern during the profiling @ Luminance Levels Below ~8 cd/m2.
i1PRO1/2 is not so accurate on everything below ~10cdm/2..It will return to you chromaticity readings but it will be fake.
You can run a test to see where your i1pro1/2 doesn't return trusTED readings.
Profile your colorimeter with using your spectro and run a 21-Step Grayscale with your spectro and with your profiled colorimeter.....you will see that at 50%-100% grayscale both meter will return to your similar readings but lower you will see that i1pro2 will not track well your colorimeter readings.....At the point you will see that problem is starting, check the Luminance level of that point and you will see at what cdm2 is the limit you can trust at the future ;)
Examples / Why we have to always profile with 100% Amplitude patterns with i1pro1/2:
If you have a Display with White @ 120cd/m2 with Gamma 2.2:
If you perform profiling with 100% Amplitude Patterns then you will have:
100% White @ 120 cd/m2
100% Blue @ 8,6 cd/m2
If you perform profiling with 75% Amplitude Patterns then you will have:
75% White @ 63,5 cd/m2
75% Blue @ 4,5 cd/m2
If you have a Projector with White @ 14fl = 48cd/m2 with Gamma 2.2:
If you perform profiling with 100% Amplitude Patterns then you will have:
100% White @ 48 cd/m2
100% Blue @ 3,4 cd/m2
100% Red @ 10,2 cd/m2
If you perform profiling with 75% Amplitude Patterns then you will have:
75% White @ 25,4 cd/m2
75% Blue @ 1,8 cd/m2
75% Red @ 5,4 cd/m2