The Dell U2518D achieved a remarkable accuracy after calibration. For the calibration, we set Picture mode to 'Custom Color' which is the mode that allows changing the monitor's RGB balance. The white balance dE and color dE are below 0.5, which means that the level of inaccuracy is almost unnoticeable. The gamma curve was corrected to match more closely the target curve and although the overall value is now a bit further from our 2.2 sRGB target the overall result is better. Finally, the color temperature, after calibration, it is much closer to our 6500k target.

You can download our ICC profile calibration here. This is provided for reference only and should not be used, as the calibration values vary per individual unit even for the same model due to manufacturing tolerances.