Grayscale, color fidelity, saturation and gamut to factory settings
Now let’s take a closer look at the color performance in standard mode (default) and sRGB mode. It’s a shame that I wasn’t able to test the monitor seven years ago, because I would have been interested in the ageing process. Does a factory calibration lose color accuracy? Unfortunately, we won’t find out here and now. But at least we can find out the current state of affairs. For your information: Apart from the uniformity, everything was measured with the UPRtek MK550T.
Color space coverage
Gray Scale, Saturation, ColorChecker @ Default Settings (100 % APL)
Gray Scale, Saturation, ColorChecker @ OSD sRGB Profile (100 % APL)
Interim conclusion
Unfortunately, the MX25AQ cannot deliver more than a very usable sRGB color space. Ok, if 80 percent P3 or 78 percent Adobe RGB is enough for you – so be it. What surprised me positively was that the MX25AQ has a relatively high contrast of 1200:1. This is not a matter of course for an IPS panel, even in 2024.
I can’t say for sure to what extent the monitor was actually delivered with such “poor” factory calibration. The fact is: Gamma 2.2 (sRGB) looks different, because that is the main problem here. Both in standard and sRGB mode. The poor RGB balance (mainly in sRGB mode) then tops it all off. The poor DeltaE values in the ColorChecker confirm the obvious!
I suspect that the gamma deviations were already present at the factory and that the monitor was not really well calibrated from day one. The extent to which ASUS advertised low DeltaE values at the time or not is no longer relevant. Unfortunately, you have to make improvements yourself and you can see that on the next page.




































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