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Our main test involves using an X-Rite i1 Display Pro Plus colorimeter and utilising Portrait Displays’ 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% | 24.4 | 0.00 | ~Infinite |
| 25% | 95.4 | 0.00 | ~Infinite |
| 50% | 166.9 | 0.00 | ~Infinite |
| 75% | 239.5 | 0.00 | ~Infinite |
| 100% | 317.2 | 0.00 | ~Infinite |
Starting off with brightness testing, the FO27Q5P gets very dim at just 24 nits minimum, while it hits a maximum of 317 nits for a full-screen white. This is an improvement over other 3rd and 4th Gen QD-OLED panels, and actually sits on par, or fractionally below, 5th Gen QD-OLED panels that only launched this year.
By default, Gigabyte uses the Low APL Stabilize setting, and that results in no drop in brightness as the window size (or APL) increases. However, there are Middle and High settings too if you would rather unlock higher peak brightness levels at small window sizes, though that also results in more panel dimming as the window size increases. It's good to have the option, whatever your preference.
Screen Uniformity
Panel uniformity is very good, too – one of the lesser talked about benefits of OLED technology! You can see a warm tint to the image, but we will come onto that later.
Gamut (CIE 1976)
| Colour space | Coverage (%) |
| sRGB | 140.1 |
| DCI-P3 | 99.3 |
| Adobe RGB | 97.1 |
| Rec.2020 | 81.3 |
We see very wide gamut coverage as we'd expect from a QD-OLED panel, it well exceeds the sRGB space and delivers 99.3% coverage of DCI-P3, alongside 97.1% reporting of the Adobe RGB colour space and 81.3% coverage for Rec.2020.
Greyscale
Factory calibration is next, and this gives mixed results. Gamma is very good, closely tracking the 2.2 target and averaging 2.238. It's the default colour balance that lets us down, though, given it averages a warm 5808K.
Gigabyte does include manual colour balance, though, and with the Red channel at 94, Green at 98 and Blue at 100, we saw vastly improved results, with a new greyscale average deltaE of just 0.93.
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, where the warm colour balance also results in higher than average dE figures. Even the average of 3.61 for the DCI-P3 space is higher than we'd usually see.
sRGB Emulation Mode
Gigabyte does include an sRGB mode, though it actually clamps the gamut slightly too aggressively, reducing coverage to 91%. Colour balance is also still too warm, though gamma is still solid. We do see improved saturation and colour accuracy results versus stock, but they're a ways off the results we saw from MSI's 272QP X50.
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.
