REVIEW: NEC PA241W Part 17

	EyeOne Pro	DTP94	DTP94 (generic cor.)
White point / CCT Kelvin	6546	5769	6533
White point XYZ (normalised)	95.10 100.00 109.65	100.83 100.00 107.52	94.85 100.00 109.89
DeltaE in with regard to the EyeOne Pro	-	9,93	0,46

Without corrections, the white point measured when the DTP94 is used is considerably far off the actual value. With the generic "Wide-Gamut S-IPS" correction in iColor Display 3.6, the result improves considerably. This combination should therefore deliver absolutely satisfactory results, even if drifts caused by ageing cannot be taken into consideration.

Correction matrix for the X-Rite DTP94

Below, we measured the correction matrix for the X-Rite DTP94 used and the concrete monitor. The EyeOne Pro was used as a reference. Thus, we refer to the actual spectrum of the monitor. Therefore, the results are more precise than with the generic corrections in iColor Display. Since the X-Rite DTP94 models only demonstrate comparatively low deviations amongst one another, the lacking measurement across a large number of probes is tolerable. However, the EyeOne Pro is of course not an absolutely ideal reference. Currently, no software we know of officially supports individual correction matrices.

Colour space emulation and "MultiProfiler" in detail

Even when measuring the sRGB and Adobe RGB modes, we were able to establish that the colour space emulation on the NEC PA241W is very well implemented. At this point, we will examine a few of the finer points of the function and take a closer look at the "MultiProfiler" tool.

The desired colour space can be emulated through the inputting of standard colour value shares for the primary colours. Here, it should be considered that these standard colour shares must always be interpreted relative to a particular white point. sRGB and AdobeRGB are defined relative to D65 in the normative documents. If the user wishes to achieve a different white point and inputs these target values for the primary colours, considerable deviations may arise. At this point, the user must therefore make his/her own chromatic adjustments.

In order to illustrate the problem more clearly, we have tried to emulate the sRGB working colour space with a white point of D50. In the first case, we did not carry out any chromatic adaptation of the primary colours in the first case, i.e. we simply used the values defined relative to D65. In the second case, we adapted the primary colours ourselves with Bradford as per D50.

sRGB	D65	D50 (Bradford)
White	x: 0.313, y: 0.329	x: 0.346, y: 0.358
Red	x: 0.640, y: 0.330	x: 0.648, y: 0.330
Green	x: 0.300, y: 0.600	x: 0.321, y: 0.598
Blue	x: 0.150, y: 0.060	x: 0.156, y: 0.066

sRGB emulation (white point: D50) without chromatic adaptation of the primary colours.

Representation of the monitor colour space in lab (D50); sRGB: black grid, monitor colour space: white grid, intersection: coloured area. Emulation without chromatic adaptation of the primary colours.

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