REVIEW: Meditec SHB-22S6 TW Part 10

The Meditec SHB 22S6 TW does not perform so well when it comes to colour accuracy – at least in the default settings which we measured first. As we established very subjectively in the above extract, some grey levels are patchy. An average deviation of 3,9 dE (deltaE) is anything but good and means that even holiday snaps could not be processed reliably on the monitor.

Comparison of factory settings with sRGB standard

Factory setting	Manufacturer	Measured
White point / Kelvin	No details	6500
Brightness / cd/m²	300	282
Black point / cd/m²	No details	0,36
Gamma / average	No details	2,02
Contrast / x:1	800	782

Comment on deltaE deviation

The deviation of colour values is given in deltaE 94 (dE). Numerous grey levels are measured here as well as the primary (RGB) and secondary (CMY) basic colours. A deltaE value of 1 represents the smallest difference in colour that can be discerned by the human eye.

Most people see a difference in colours from a value of 3. However, our eyes are more sensitive to green tones so that these can already be noticed when the deviation is smaller than 3. The average deviation should be under 3 dE, with the maximum deviation under 10 dE. Up until 10 dE, colours are still sufficiently similar.

Since the Meditec SHB 22S6 TW unfortunately has no sRGB profile, the user can only improve colour accuracy and display of the sRGB colour space by using the user-defined settings together with a calibration device. In order to achieve brightness of 140 cd/m², we had to set the brightness to 0 % and also reduce the RGB values.

Our calibration was made up of the following settings: brightness 0 %, contrast 50 %, red = 44, green = 42, blue = 39. These settings allow the Meditec SHB 22S6 TW so reach a very good level of colour accuracy, with grey levels in particular being displayed better.

Comparison of calibrated profile with SRGB

Calibrated	Goal	Measured
White point / Kelvin	6500	6500
Brightness / cd/m²	140	141
Black point / cd/m²	0,00	0,18
Gamma / average	sRGB (~2,2)	2,16
Contrast / x:1	Native	782

Deviation of calibrated profile at least 1 hour after calibration

Calibrated	Goal	Measured
White point / Kelvin	6500	6500
Brightness / cd/m²	140	145
Black point / cd/m²	0,00	0,21
Gamma / average	sRGB (~2,2)	2,12
Contrast / x:1	Native	689

The average deviation is only 1,6 dE. Although this value is even better than that of the Eizo S2111W, we do not recommend the Meditec SHB 22S6 TW for semi-professional ("sRGB-") image processors, since the viewing angles lead to clear colour corruption, as is the case with all TN panel 22-inch monitors, and the monitor’s low deltaE value here is simply not sufficient on its own.

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