REVIEW: Iiyama ProLite B2206WS-B1 Part 9

Calibration to sRGB (gamma mode1) without profile compared to sRGB standard

Calibrated	Goal	Measured
White point / Kelvin	6500	6515
Brightness / cd/m²	140	140
Black point / cd/m²	0,00	0,17
Contrast / x:1	Native	821
Gamma / average	sRGB (~2,2)	2,73

For most users, this is the best colour reproduction possible. The white point has been adjusted to 6500 Kelvin without saving a specially adjusted colour profile. The deviations in blue are no longer acceptable with an impressive 17 deltaE and the grey balance is also incorrect. The latter could possibly be improved through using gamma mode 3.

Calibration to sRGB (Gamma mode 3) compared to the sRGB standard

Calibrated	Goal (Profile)	Measured
White point / Kelvin	6500	6539
Brightness / cd/m²	140	140
Black point / cd/m²	0,00	0,17
Contrast / x:1	Native	818
Gamma / average	sRGB (~2,2)	2,20

In the ideal case, all deltaE values should be achieved roughly in an area of up to one. The worst deviations are only in those places in which the monitor’s colour space cannot balance out sufficiently.

As already mentioned, the strongest deviation is 6,5 deltaE for blue. However, the average is only a measurement and of course does not reflect the subjectively perceived image reproduction, which unfortunately deviates negatively from these values.

Because of the calibration, the contrast has dropped to 818. The gamma value and white point can be matched perfectly.

Representation of the RGB correction curve after sRGB calibration. The closer the three coloured lines lie to the 45° axis, the fewer colours must be discarded by the graphics card for correct calibration and the more intact the colour gradients remain.

A calibration was also carried out with gamma mode 1, but the values are almost identical and therefore do not need to be shown. The lower banding also speaks in favour of gamma mode 3. The compensation curve for gamma mode 1 would have bulged towards the bottom and would deviate more strongly from the bisecting lines.

The other colour modes "warm" and "cold" do not deliver a better result, but looked really extreme and are hardly usable.

UGRA test

In order to close off the colour test, the B2206WS must go through the UGRA test. To this end, the model is calibrated to the set values of 5800 Kelvin, Gamma 1.8 and 120 cd/m². Since the monitor has various gamma modes and the third of these achieves the lowest gamma value, we used this for the test.

The test already uses the new Media Wedge V 3.0 as per ISO 12647. Since the end of May 2008, tougher criteria have applied for the UGRA, which are listed in the ISO Norm 12647 (not yet released). In particular for the grey balance, the criteria have been changed to a great extent, so that a large number of monitors which achieved the certification under V 2.0 now leave empty-handed.

Thus, comparability with old UGRA protocols is no longer a given. It can quickly be seen from the result whether the test has been carried out under V 2.0 or 3.0. Version 2.0 delivers four results under "soft proofing" and Version 3.0 delivers seven.

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