REVIEW: ViewSonic VX2268wm Part 9

The Viewsonic VX2268wm, too, has to struggle with the typical weaknesses of the factory settings: the brightness is much too high and the gamma is very unstable. In addition, the white point really deviates from the sRGB target. The low black value means that the contrast value of 1,000:1 indicated by the manufacturer is nearly achieved. The grey deviations stand out somewhat since the gradation deviations a lot from the target (Gamma: sRGB), whilst the deviations in the primary and secondary colours are at an acceptable level apart from one peak. The average colour deviation of 3.3 is still at a tolerable level.

Since the factory settings are very important as a starting point for most users, we prepared a more precise representation with the aid of HCFR.

Left: colour temperature; right: RGB shares in the grey levels.

Left: Gamma gradient; right: monitor colour space in the two-dimensional CIE-xy diagram.

Whilst the grey axis of the Viewsonic VX2268wm behaves in a neutral manner, the gamma is somewhat problematic.

Comparison of sRGB mode with the sRGB standard

sRGB Mode	sRGB standard	Measured
White point / Kelvin	6500	5813
Brightness / cd/m²	120	100
Black point / cd/m²	0,00	0,28
Contrast / x:1	Native	356
Gamma / average	sRGB (~2,2)	2,28

In order to allow for work close to the target values, many manufacturers offer a pre-defined sRGB profile – and Viewsonic is no exception. However, this colour profile only performs slightly better than the factory settings. The white value is not matched correctly, but the gamma value is.

Profile precision sRGB

When the monitor is calibrated, we check the profile precision first. Provided that the measuring device is functioning precisely, low deviations allow us to conclude that the monitor characteristics have been captured correctly and remain stable. The CMM (ColorManagementModule) colour management software can thus transform as ideally as possible into monitor RGB (the monitor’s colour space sets the limit at the latest). If the deviations rise noticeably at a later point in time, it is time for a new calibration and subsequent profiling.

Even in unmanaged environments, the user benefits from the changes made to the screen settings and graphics card (and in this case, the monitor LUT) in the course of the calibration, which should give rise to a neutral grey axis, the required gradation and white point.

Profile precision	Profile value	Measured
White point / Kelvin	6542	6493
Brightness / cd/m²	118	117
Black point / cd/m²	0,18	0,18
Contrast / x:1	655	649
Gamma / average	2,23	2,14

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