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I performed all tests in the DualUp 28MQ780’s Custom picture mode. It makes all picture controls available, including gamma presets, custom color temp and even saturation and hue adjustments for all six colors.
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 28MQ780 looks a tad purple out of the box with visible errors from 30% brightness up to the maximum white level. Given the promise of factory calibration, this is a little disappointing, but the errors are easily corrected. Tweaking the RGB sliders yields a visible and measurable gain in performance with the average grayscale error now at 1dE. Gamma tracks well with only a small dip in the middle and upper steps. This error is very minor and difficult to see in content.
The sRGB mode has a fixed color temperature which is a little reddish green. Again, the error is visible from 30% on up. Gamma tracking is nearly identical to Custom mode.
- Grayscale Error Default – 5.75dE
- Grayscale Error Calibrated – 1.00dE
- Gamma Value Range – 0.17
- Average Gamma, Deviation From 2.2 – 2.73% (2.14 actual value)
The 28MQ780’s default grayscale error of 5.75dE is a bit higher than I’d expect for a monitor at this price point. But it calibrates to the high standard I’d expect. With a tight 0.17 range of values and an average of 2.14, gamma runs close to the specification. This is very good performance overall.
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.
The 28MQ780’s Custom picture mode uses the monitor’s full native gamut, which covers nearly all of DCI-P3. You can see slight hue errors in the default chart that are in keeping with the white point error that moves toward the magenta secondary. The average error drops from 3.03dE to 1.25dE after the RGB sliders are adjusted. All color points are now in contact with their targets.
The sRGB mode has no visible color errors with an average of 2.91dE. This is excellent performance.
- Color Gamut Error – 1.25dE (Custom), 2.91dE (sRGB)
- Color Gamut Volume – 95.52% DCI-P3, 104.6% sRGB
With such low color errors, both before and after calibration, I rate the 28MQ780’s color accuracy as excellent. The only thing required is adjustment of the RGB sliders to bring grayscale tracking in line.
Color gamut volume is among the best of the wide gamut displays I’ve tested. Only a handful of monitors are more colorful than the 28MQ780. It is well suited for color-critical apps. A software profile is recommended but not required since you can easily switch between DCI-P3 and sRGB modes.
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