Grayscale, color fidelity, saturation and gamut to factory settings
ASUS has never really disappointed me when it comes to color accuracy. I hope that the PG34WCDM can also deliver today. Ok, some things can be predicted, such as the color space coverage in terms of Adobe RGB and Rec. 2020, because LG OLED panels can’t keep up with QD OLED from Samsung. But in the end it’s a matter of taste anyway, because you don’t need Adobe RGB for HDR or for gaming in general. What interests me is this:
Can ASUS really deliver this? Hmm…
Color space coverage
Color Space Coverage
The PG34WCDM comes with a lot of standard color space and – typical for LG – the panel is DCI-P3 dominated. Hobby Adobe RGB users will certainly not be happy here and will have to look for other alternatives.
Gray Scale, Saturation, ColorChecker @ Default Settings (100 % APL)
Please note that I have carried out all measurements on this page with a 100 percent window. Explanation follows… The next picture shows why you should definitely activate the Uniform Brightness Mode in the OSD in SDR.
This is where the Automatic Brightness Limiter (ABL) is up to mischief. This is not only annoying, but also leads to extreme deviations in terms of color accuracy. With a DeltaE > 5 in relation to the gray scaling, I can save myself the ColorChecker measurement. All that comes out is groats! So it’s better to activate the uniform image brightness.
ASUS PG34WCDM Default Settings
This already looks much better. The deviations that are still present are solely due to the unclamped color space. If I now measure against DCI-P3 instead of sRGB, it looks like this.
Gray Scale, Saturation, ColorChecker @ Default Settings DCI-P3 (100 % APL)
ASUS PG34WCDM Default DCI-P3
Gray Scale, Saturation, ColorChecker @ OSD sRGB Color Space (100 % APL)
The Color Space presets can be found in the OSD. If you really value a very good sRGB mode, please use this one.
It will look like this:
ASUS PG34WCDM sRGB color space
Gray Scale, Saturation, ColorChecker @ OSD sRGB Cal Mode (100 % APL)
ASUS PG34WCDM sRGB Mode
Interim conclusion
The PG34WCDM is the best calibrated OLED monitor I have ever seen. ASUS has done everything right with the sRGB and DCI-P3 pre-sets. No lockdown of the essential settings, e.g. white point control, gamma etc. What I like best is that ASUS has managed the white point and RGB balance very well. As long as you have the Uniform Brightness Mode activated, you get an almost perfect monitor for sRGB and P3. Only the strong curvature of 800R and the sub-pixel layout could still be disturbing factors here. However, this depends on the use case on the one hand and your own perception on the other.
Where does the panel have its weaknesses? The maximum brightness in some colors, e.g. 100 percent yellow in the ColorChecker. (See picture above) A QD OLED panel can do this better. Especially if you test with a 100 percent APL. This subtle – albeit small – difference between QD-OLED and WOLED can be seen especially in HDR. Maybe I can capture that with a few pictures. Take a look at my articles on the Samsung OLED G8 or MSI QD-OLED, which I also tested with a 100 percent APL – they don’t deviate that much. This is a disadvantage of the RWBG subpixel layout.
- 1 - Introduction, Features and Specs
- 2 - Workmanship and Details
- 3 - How we measure: Equipment and Methods
- 4 - Pixel Response Times
- 5 - Display Latencies
- 6 - Color-Performance @ Default Settings
- 7 - Direct Comparison and Power Consumption
- 8 - Color-Performance calibrated
- 9 - HDR-Performance
- 10 - Summary and Conclusion
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