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REVIEW: Asus PA238Q Part 6

Our measurement confirms the darkening mentioned before – the biggest differences in brightness distribution occur in the top left (12.49%) and right (15.67%) corners. All other values remain in single digits. In terms of colour homogeneity, DeltaC values of 2.83 and 2.30 represent the largest deviations, which for a device without an image-homogeneity improving circuit is a good level.

Overall, results are only just good, though the high variations of brightness distribution may come to light disturbingly at professional image-editing. We must still say, however, that brightness distribution and colour homogeneity may vary from device to device within a series.

Viewing angles

Horizontal and vertical viewing angles.

The picture shows the screen area of the Asus PA238Q from horizontal viewing angles of +/- 75 degrees and vertical angles of +60 and -45 degrees. Both vertically and horizontally, the PA238Q displays high contrast an pure colours, even from very wide viewing angles. The only exception, a magenta cast, occurs when both the horizontal and the vertical viewing angle are at +/- 45 °. In our photo, this behaviour is particularly well documented on the right side, when viewing the red jelly baby from above.

We still must say, however, that it is very unlikely to look at the panel from such high angles in practice, neither vertically nor horizontally. Because the effect is quite strong with the PA238Q, it costs it a "Very Good" in this area.

Colour reproduction

Measurements and calibration

After measuring the Asus PA238Q extensively before and after calibrating and profiling, we evaluate the results, which are particularly interesting for digital image processing. As far as office and game applications are concerned, a sufficient neutrality of the screen is important leastways. All measurements are evaluated using our self-developed software. This allows for precise and detailed statements on the present test model.

Lab colour space comparison (D50)

First, we measure how well the Asus PA238Q covers different colour spaces. As a reference, we use the sRGB working space. Additionally, we compare it with the ISOcoated V2 profile. It is based on the FOGRA39 characterisation data and represents standard printing conditions for offset printing on certain paper types. The exact conditions can be referred to in the following PDF document. Since the screen does not have an extended colour space, we do not carry out a comparison with ECI-RGB or AdobeRGB 2.0.

3D colour space comparison

Explanation of 3D views and information as to how they are created.

ISOcoated (FOGRA39): 89,4 % coverage

sRGB: 94,5 % coverage

Unfortunately, the PA238Q does not achieve one hundred per cent coverage of sRGB colour space, as promised by the manufacturer, but 94.5% turn out to be very high for a device with an LED backlight. The coverage of the ISOcoated colour space of 89.4% is reasonable, too. These results are profitable for home use and semi-professional image editing. Professionals, however, demand a monitor with larger colour space, a purpose white-LED backlight currently still is the wrong technology for.

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