Abysmal Post-Calibration Contrast Ratio

[Spoon, Ph.D.]

I have a Dell p2415q 4k monitor advertised as having a static contrast ratio of 1000:1. I have an i1DisplayPro colorimeter that I have been using to calibrate this monitor via both DisplayCal and the X-Rite calibration software. However, in both situations my post-calibration contrast ratio is reported as being in the realm of 200:1. I am not sure what to do at this point. Colors are accurate with low dEs but the contrast ratio is driving me nuts.  I do not have access to the nVidia control panel settings as I am using a laptop with a 960m to drive my monitor (which entails that the display signal being sent over HDMI to my monitor originates from the Intel iGPU).

I have noticed also that when I attempt to verify my calibration the colors of the monitor shift for the first 3 patches before returning to normal for the remaining patches – almost as though the calibration profile reverts to the pre-calibrated state for those 3 and then returns to its post-calibrated state afterwards.

Any help would be greatly appreciated! I have attached my verification report below.

DisplayCal Settings:

White level drift compensation: Off

Black level drift compensation: Off

Output levels: Auto

Correction: Spectral: LCD White LED IPS (WLED AC LG Samsung)

Observer: CIE 1931

Whitepoint: Color Temperature, 6500K, Daylight

White Level: As Measured

Black Level: As Measured

Tone Curve: Gamma 2.2, Relative

Black Output Offset: 100%

Ambient Light Level Adjustment: Off

Black Point Correction: Off

Calibration Speed: High

Profile Type: XYZ LUT + Matrix

Black Point Compensation: Off

Profile Quality: High

Testchart: Auto-optimized

Amount of Patches: 175

Patch Sequence: Minimize Display Response Delay

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[Florian Höch]

Your black level is extremely high (possibly you are driving the monitor with video levels, while it expect full range). You should probably check your monitor settings, and make sure you drive the monitor with the correct input levels.

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