Originally Posted by skschatzman
Updated my SDR calibration. Also I remade the offset matrix and used the BenQ V2 profile as it was closer to my i1 Pro2 readings than the Samsung profile.
What was the target luminance for your SDR calibration? Have you noticed any black crush, post calibration?
My PQ65 recently updated to the 18.104.22.168 firmware, so I too ran an SDR calibration last night. I targeted REC709, BT1886 EOTF @ 120nits. After the calibration I was generally happy with the results except that I noticed black crush which I don't remember seeing before. I started my calibration by turning off all of the processing settings, changing picture mode to Calibrated Dark and Gamma to 2.2. My backlight is set to 6 to achieve 120nits at 100% white. I then used the RGB Gain controls to balance the RGB levels @ 100% white. After that I went through a Greyscale and color calibration.
My post calibration settings are:
Color Tuner: R,G,B,C,M,Y
White Balance: R,G,B
Compared to your set mine must be deficient in Red, so I had to increase the Red gain and decrease the Green gain. I also notice that my 5% gains are significantly higher than yours.
Could this indicate some problem which is causing the black crush?
It looks like your set has a dip from 20%-50% while mine has a peak from 60%-90%.
I finished the calibration late last night so I didn't get a lot of time to check out the results but I did go through a couple of dark scenes to test the black performance and look for banding.
In Game of Thrones Season 8 Epsiode 3 (the latest) I see black crush in Thyion Lanister's cloak in the opening sequence as the camera focuses on him just after Sam Tarly leaves the scene.
In the last episode of season two of Stranger Things, when eleven and the Sheriff are in the stairwell helping the injured scientist I notice significant banding on the wall behind eleven.
Other than these dark issues, I'm happy with what I'm seeing. Do you have any suggestion about what I could do differently in my calibration to eliminate the black crush? Should I use a Log Gamma 2.2 target for EOTF rather than BT.1886?