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Our HDR benchmarking uses Portrait Displays’ Calman software. To learn about our HDR testing, see our breakdown of how we test PC monitors.
The M27PG135F supports HDR10 signals and will switch modes automatically once you set the OSD option to Auto. There is no dynamic dimming, so contrast is about the same as SDR. But color accuracy is quite good, so HDR content has a little more impact.
HDR Brightness and Contrast
The M27PG135F is a tad brighter in HDR mode with 390 nits of peak output. Black levels rank last in this comparison as does contrast, which is about the same as SDR at 1,075.2:1. Given the color results I’m about to show you, this is unfortunate because with dimming, HDR would be significantly better.
Grayscale, EOTF and Color
The M27PG135F’s HDR grayscale tracking is a little cool in tone once you get past 40% brightness. This is typical performance for the category. The EOTF trace is nearly perfect except for the zero and 5% steps, which are too light. This makes shadow detail very visible but also robs the M27PG135F of a true black. This is where a dynamic dimming option would make an impact. The tone-map transition is at 65%, which is correct for the measured black and white levels.
The M27PG135F nails its HDR color tests with nearly full and accurate coverage of DCI-P3. Only magenta is slightly off-hue, but that error is hard to spot in actual content. Blue has a bit of extra vibrance and green is lush and rich. Most wide-gamut screens come up short in the green primary but not the RCA. It also does an excellent job in the Rec.2020 test, with all points on target until color runs out. This is the way it should be since most content lives in the 20-60% saturation range.
Test Takeaway: It’s a bummer that the M27PG135F doesn’t have dynamic contrast because its HDR color and luminance tracking is very close to the mark. It has a little more impact than SDR, thanks to that wide gamut. When compared to other monitors at this price point, it is more colorful, but its image is less deep due to those higher black levels.
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