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The MO27Q28G supports HDR10 content with five specific picture modes, some of which include adjustable brightness. The switch is automatic when HDR10 signals are used.
HDR Brightness and Contrast
The MO27Q28G is one of the brighter OLEDs I’ve tested, but it isn’t the very brightest. That honor, at least in the 27-inch QHD category, belongs to the ViewSonic, which delivers over 931 nits from a 25% window. Gigabyte rates the MO27Q28G at 1,500 nits for a 1.5% window and there is no reason to doubt that claim. Highlights are very forward and specular in all the content I viewed. It’s rated for VESA DisplayHDR 500, and it meets that spec with room to spare.
Grayscale, EOTF and Color
For the color tests, I measured the default mode labeled simply “HDR.” It delivers decent grayscale tracking with a slight purple tint visible at 50% and greater brightness. The EOTF tracks to near perfection with slight darkness from 0 to 40%, then slight lightness up to the tone-map transition point at 65%. This is the correct level for the measured white and black levels.
In the color test, it oversaturates in the same way as most of the HDR monitors I’ve tested. This is done to punch up color and more clearly separate it from SDR, and it is effective here. By keeping the saturation points linear, there is no reduction of fine detail at any point in the brightness range. The MO27Q28G goes a bit past the perimeter in the DCI-P3 test, and when measured against BT.2020, it covers 90% red, 75% green and 95% blue.
Test Takeaway: The MO27Q28G has a tad more HDR brightness than most, but not all of its competitors. It is extremely colorful and very accurate, which gives the HDR image high impact and a vivid presentation. You can adjust the HDR modes if you like, but leaving it at the default setting will be fine for most users. This is one of the better HDR OLEDs I’ve reviewed.
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