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The GP27Q has many picture modes and gamut options that can be confusing if you start tweaking too much. I advise sticking with User 1 and leaving the gamut on Auto. With a few simple adjustments, the picture goes from good to stunning.
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.
Out of the box, the GP27Q has a bluish-red grayscale with visible errors starting at 20% brightness. This makes the picture flat with familiar tones like skin and grass looking too cool. Gamma tracking is excellent, though, which means this is a good starting point.
The User color temp allows fine control, so I eliminated all grayscale errors. But I also had to reduce the contrast slider and change gamma to 2.4 because of control interaction. Ultimately, the picture is much better, so I recommend using the settings from page one.
The fixed gamut modes deliver decent accuracy, which is good because you can’t alter the color temp in any mode but Auto. I’ve added the sRGB chart here as an example of the performance you’ll see in all the gamut modes, sRGB, Adobe RGB, DCI-P3 and Rec.2020.
Comparisons
The GP27Q’s default grayscale error of 7.8dE means you’ll want to make some adjustments to get the best image. You can reduce this number to around 3.2dE in one of the fixed gamut modes. Or calibrate to get on par with the results delivered by the competition.
Gamma tracking compares well after calibration with a tight 0.29 value range and a final result of 2.18, a deviation of just 0.9%. Note that this is achieved with local dimming turned off. When it’s engaged, the black level can’t be measured, so it’s impossible to get an accurate gamma result. But trust me; the picture looks better with it turned on. I recommend completing any calibration and adjustment before engaging local dimming.
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.
To illustrate the GP27Q’s gamut performance, I’ve included the default measurement referenced to both DCI-P3 and Rec.2020. You can see that Cooler Master is swinging for the fences by going for the Rec.2020 spec. The GP27Q and the GP27U cover a larger color space than nearly any other monitor. SDR content viewed in this gamut will look very colorful and sometimes too much so. It will depend on user preference but remember, smaller gamuts are available in the OSD, so you have choices.
I calibrated using the Rec.2020 reference and got an excellent result of just 2.82dE. Since full 2020 monitors are rare, it’s awesome that Cooler Master can deliver reference-level performance for just $550.
In sRGB mode, the red primary is a bit under-saturated, and the blue white point pulls magenta and cyan off-hue. But enough points are on target to get the average down to just 2.15, which is very good performance.
Comparisons
In the gamut error chart, I’ve referenced Rec.2020 for the two Cooler Master monitors and DCI-P3 for the others. Any value under 3dE indicates no visible error, so both screens deliver excellent accuracy.
The volume chart shows why you should consider buying one of these Cooler Master monitors. Both GP27s render well over 100% of DCI-P3. While their sRGB gamuts are a little under the mark, that’s only due to the red primary coming up a tad short. By loading a compensation profile, you can use the GP27Q for color-critical work. Since it has so much color, it can correctly render any gamut smaller than Rec.2020, which is all of them.
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