REVIEW: NEC LCD3090WQXi-BK Part 12

Explanation of deltaE deviation

Deviations in colour are measured in deltaE 94 (dE). Various grey gradients, the primary (RGB) and the secondary (CMY) basic colours are measured. A deltaE value of 1 represents the smallest difference in colour that can be perceived by the human eye Most people notice a difference in colour from a value of 3. However, our eyes are more sensitive to green tones, so smaller differences can be perceived here The average deviation should be less than 3 dE and the maximum should be under 10 dE, or better still, under 6 dE. Up to 10 dE, two colours are still sufficiently similar.

Comparison of factory settings with sRGB standard

Factory setting	sRGB standard	Measured
White point / Kelvin	6500	5710
Brightness / cd/m²	140	360
Black point / cd/m²	0,00	0,50
Contrast / x:1	Native	719
Gamma / average	sRGB (~2,2)	2,2

As is unfortunately often the case with WCG displays, the factory settings are not optimised for sRGB display. The white value is considerably warmer than the target value, at 5710K. The deviations of the colour values are over 10 deltaE in one case (green), whilst the grey values are matched rather well.

The gamma value of 2,2 is exactly the same as the target. Overall, the result is not ideal, however it is better than the results delivered by the Eizo SX3031W in its factory settings.

Comparison of des sRGB mode with sRGB standard

Factory setting	sRGB standard	Measured
White point / Kelvin	6500	5773
Brightness / cd/m²	140	330
Black point / cd/m²	0,00	0,40
Contrast / x:1	Native	824
Gamma / average	sRGB (~2,2)	2,19

Activating the sRGB mode does not make much of a difference. The deviation of the white point from the target value remains. Deviations for the colour values change, but remain almost at the same level on average.

The gamma value remains unchanged and therefore achieves the target. Similarly to the Eizo SX3031W, the NEC 3090WQXi therefore does not come with a really useable sRGB pre-defined mode.

Comparison of calibrated profile with sRGB standard

Calibrated	Goal	Measured
White point / Kelvin	6500	6534
Brightness / cd/m²	140	143
Black point / cd/m²	0,00	0,30
Contrast / x:1	Native	476
Gamma / average	sRGB (~2,2)	2,18

When calibrated, the white point and gamma value are optimal. The average deltaE deviation can be reduced, but it is not ideal – which is not surprising given the extended colour space.

With an average deviation of 3,3 deltaE, the NEC 3090WQXi performs minimally better here than the Eizo SX3031W. Users who wish to work exclusively in sRGB should select a model without an extended colour space.

We made the following changes from the factory settings in the OSD: Brightness 55,1 %, R=215, G=242 and B=242. The gamma value remains at 2,2. "Evenness" is at level 3.

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