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To test the MO27Q28G’s color accuracy, I switched from the default, Eco, to Standard, to have access to the monitor’s full dynamic range and calibration options.
Grayscale and Gamma Tracking
Our grayscale and gamma tests use Calman calibration software from Portrait Displays. We describe our grayscale and gamma tests in detail here.
The MO27Q28G starts out a tad warm in tone with slight purple shades visible in brightness steps from 50-100%. Gamma tracks close to the reference in a linear fashion and is a tad dark. This can be compensated for by upping the brightness slider a little. This is solid out-of-the-box performance.
With calibration, grayscale tracking reaches reference-level with no errors exceeding 1dE. Gamma is unchanged. It’s a little dark, but since it tracks linearly, there is no loss of detail.
The sRGB mode shows similar results with slightly dark gamma and a warm grayscale. There are no calibration options here; you can only change the overall brightness level.
Comparisons
The MO27Q28G starts at 4.63 dE, so I recommend calibrating the RGB sliders. Gamma is fine, whether you adjust or not, the 2.2 preset works well. And you’ll see below that color is on spec whether you calibrate or not. After a few tweaks, it’s right in the mix with the very best, at 0.43 dE. That’s pro-level accuracy. Gamma runs a tad dark at a 4.54% deviation (2.30) but tracks with a tight 0.08 range of values, also among the very best I’ve recorded. I have no complaints here.
Color Gamut Accuracy
Our color gamut and volume testing use Portrait Displays’ Calman software. For details on our color gamut testing and volume calculations, click here.
In the color test, you can see that the MO27Q28G fully leverages its large gamut for SDR content. It’s slightly oversaturated in the primary hues, but the points are linear, so the picture looks natural and correct. It’s extremely colorful in a way that will appeal to all users. Calibration tightens up the chart slightly, but the visual change is subtle. This is excellent performance.
To measure sRGB, I selected the sRGB picture mode, which cannot be calibrated. It has adjustable brightness, but that is all. It’s a tiny bit oversaturated, but you won’t notice an issue. It’s fully qualified for color-critical applications.
Comparisons
The MO27Q28G’s color error goes from 2.62dE out of the box to 2.45dE after calibration. That’s a tiny change that you aren’t likely to see in content. The improvement to grayscale tracking is the reason to make the adjustments. OLEDs as a category have very accurate color so the MO27Q28G is solidly in the mix there.
Where it excels is color volume and it is the equal of any Quantum Dot display with nearly 110% coverage of DCI-P3. Though the ViewSonic does without this tech, it still looks very colorful with almost 100% coverage. You can see that extra 10%, though, mostly in red and green, which are more vivid. The MO27Q28G covers an ideal 103.63% of sRGB, which is also a good thing. It can be used for any situation where accurate and saturated color is needed.
Test Takeaway: The MO27Q28G demonstrates excellent color accuracy and high gamut volume. It is on par with the best Quantum Dot displays I’ve reviewed with a bright and colorful image that pleases in all areas. It has good out of box color but grayscale tracking accuracy benefits from calibration.
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