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Our main test involves using an X-Rite i1 Display Pro Plus colorimeter and utilising Portrait Display's Calman Ultimate software. The device sits on top of the screen while the software generates colour tones and patterns, which it compares against predetermined values to work out how accurate the screen is.
The results show:
- A monitor’s maximum brightness in candelas or cd/m2 at various levels set in the OSD.
- A monitor’s contrast ratio at various brightness levels in the OSD.
- Gamut coverage, primarily focusing on sRGB and DCI-P3 colour spaces.
- Greyscale accuracy, measured across 20 shades, with an average colour balance reported.
- The exact gamma levels, with a comparison against preset settings in the OSD.
- The colour accuracy, expressed as a Delta E ratio, with a result under 3 being fine for normal use, and under 2 being great for colour-accurate design work.
We first run these tests with the display in its out-of-the-box state, with all settings on default. If there is an sRGB emulation option or other useful mode then we may test that too. We then calibrate the screen using the Calman Ultimate software and run the tests again.
You can read more about our test methodology HERE.
Default settings
Brightness and Contrast (Full Screen)
| OSD Brightness | White Luminance (cd/m2) | Black Luminance (cd/m2) | Contrast Ratio |
| 0% | 17.9 | 0.00 | ~Infinite |
| 25% | 72.2 | 0.00 | ~Infinite |
| 50% | 128.8 | 0.00 | ~Infinite |
| 75% | 185.7 | 0.00 | ~Infinite |
| 100% | 244.8 | 0.00 | ~Infinite |
Kicking off with brightness testing, performance is typical of QD-OLED, with a range from just 18 nits, up to just below 250 nits. Contrast is effectively infinite given the per-pixel nature of OLED.
By default, output luminance is completely steady regardless of APL, or window size, and this is thanks to the APL Stabilize Low setting. However, there's also a Middle and a High setting which will let you achieve higher peak brightness for smaller window sizes, but that results in noticeable dimming as the window size increases. It's good to have the option, though, so users can adjust to their preference.
Gamut (CIE 1976)
| Colour space | Coverage (%) |
| sRGB | 139.2 |
| DCI-P3 | 99.2 |
| Adobe RGB | 97.8 |
| Rec.2020 | 80.8 |
As for gamut, this is very wide indeed, far surpassing the sRGB space and delivering 99.2% DCI-P3, 97.8% Adobe RGB and 80.8% coverage for Rec.2020.
Greyscale
Next we have greyscale, with the MO27Q2 delivering solid, if unspectacular, results. The overall colour balance is slightly warm as we often see from QD-OLEDs, though it's just a 6% deviation from the 6500K target. Gamma is also a touch high, averaging 2.307, though that's fairly minor in the grand scheme of things. Overall, the average greyscale dE 2000 of 2.4 indicates performance that's good enough for most users.
Saturation
Saturation levels are high, as we'd expect from a QD-OLED, leading to a fair degree of inaccuracy relative to both the sRGB and DCI-P3 colour spaces.
Colour Accuracy
That carries over into our colour testing, too – the average dE 2000 of 4.82 is what we'd expect relative to the sRGB space, though we do see an improvement when testing against the DCI-P3 space.
sRGB Emulation Mode
Gigabyte does include an sRGB mode too, which does a good job at clamping the gamut to prevent over-saturation. This doesn't make any changes to overall greyscale performance, still giving the slightly warm colour balance and gamma that's a touch high, but it does reduce the saturation and colour accuracy dE results to more impressive levels, so it's definitely worth using.
Calibrated Results
For the best results we did also run through a full calibration. This saw stellar accuracy across the board, indicating exactly what the panel is capable of if you have the right hardware and software tools.
