REVIEW: NEC PA241W Part 13

The "AdobeRGB" image mode provides suitable settings for the emulation of working colour space.

The result here is also respectable and is in the same range as that for the sRGB emulation. In light of the almost complete coverage of AdobeRGB and the good result in the course of the sRGB emulation, this was no surprise.

Profile precision

When the monitor was calibrated, we then checked the profile precision. Provided that the measuring device is functioning correctly, low deviations allow us to assume 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. If the deviations increase at a later point, it is time for a new calibration and subsequent profiling.

Even in unmanaged environments, the user can benefit from the changes made to the screen settings and graphics card LUT (or in this case, the monitor LUT) during calibration, which give rise to a neutral grey axis and the desired gradation and white point.

Below, we will limit ourselves to the monitor profile created in the course of the calibration to the sRGB recommendations for white point and gradation. After calibration and profiling, a profile test was carried out from the software used, which compares the actual condition of the monitor with the transformations arising from the monitor profile.

The reference values arise as follows from the monitor profile:

Parameter	Target	Measured
White point / CCT Kelvin	6550	6545
White point XYZ (normalised)	95.07 100.00 109.67	95.10 100.00 109.65
DeltaE from target white point	0,48	0,48
DeltaE from black body curve*	0,15	0,21
Luminance / cd/m²	139,04	138,9
Black point / cd/m²	-	-
Contrast / x:1	-	-
Gradation / average	sRGB	~sRGB

* CCT reference

There are no surprises when it comes to this check: the NEC PA241W behaves in a "colorimetrically stable "manner. A repetition of the profile validation 24 hours later also failed to uncover any significantly higher deviations.

The software calibration and subsequent profiling were based on the parameters listed further below (luminance: as long as this can be achieved with on-board means). The quotation marks should denote that there is no target-oriented colour space emulation in the course of the calibration, but instead only the targets listed in brackets and the highest possible level of neutrality and/or linearity. The "colour accuracy" is only achieved in conjunction with colour management-enabled software and the monitor characteristics captured in the profile.

The white point here in particular is no fixed value, but should be oriented towards (constant!) environmental and/or sampling conditions in the ideal case. The gradation is firmly linked with the respective working colour space, but within the scope of the colour management, an accurate display with regard to the source colour space and its parameters is ensured through the transformations of the CMM, even when the gradation of the monitor deviates (as long as this is stored correctly in the screen profile). Provided that the monitor has powerful electronics (LUT > 8-Bit), however, it makes sense in any case to select a gradation that is intended for your preferred working colour space as long as this is possible using on-board means.

Note: The standard colour space values selected in the OSD do not match the actual values for D65 (x: 0.313, y: 0.329) and D50 (x: 0.346, y: 0.358) exactly. This is legitimate at this point because the factory calibration can of course not be one hundred percent accurate or there may also be deviations in the measuring equipment.

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