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HDR Performance

The PA27USD supports every HDR standard currently in use except for HDR10+. That includes HDR10 (PQ), Hybrid Log Gamma (HLG) and Dolby Vision. It’s certified for VESA DisplayHDR True Black 400.

Our HDR benchmarking uses Portrait Displays’ Calman software. To learn about our HDR testing, see our breakdown of how we test PC monitors.

HDR Brightness and Contrast

· HDR White Luminance – 452.1932 nits

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· HDR Black Level – Unmeasurable

· HDR Sequential Contrast – Unmeasurable

The VESA DisplayHDR standards use a 25% window pattern to set their parameters and the PA27USD easily surpasses 400 nits with a score of 452 in my test. Smaller windows are claimed at 1,000 nits and I have no reason to doubt this. Black levels and contrast are immeasurable.

Grayscale, EOTF and Color

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Asus ProArt PA27USD — (Image credit: Portrait Displays Calman)

The PA27USD offers multiple EOTF options, including PQ Optimized, Clip or Basic. I found that Clip came closest to the reference when measured white and black levels are taken into account. This flexibility lets you master HDR for displays with less accurate tone-mapping. As expected, grayscale tracking is visually perfect. All the HDR modes can be calibrated with the built-in meter or outboard software just like SDR.

For the color test, I had the choice of P3 or BT.2020 gamuts. 2020 came the closest to all saturation targets for both P3 and 2020 references. The 2020 saturations remained linear so points over 50% appear undersaturated. This is a minor error. I also noted slight hue errors in magenta. All of these are easily corrected using whichever calibration method you choose. The BT.2020 chart tops out at 90% red, 75% green and 95% blue.

Test Takeaway: The PA27USD is very color accurate in all its HDR modes and can be calibrated to a high standard using the same methods as the SDR presets. It is a P3 monitor so it won’t fully cover BT.2020. You get three different EOTF options for HDR10, which is handy for content creation. It has a brightness similar to other 4K OLEDs I’ve tested, with effective variable brightness that pushes peak highlights up to 1,000 nits.

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Christian Eberle is a Contributing Editor for Tom's Hardware US. He's a veteran reviewer of A/V equipment, specializing in monitors. Christian began his obsession with tech when he built his first PC in 1991, a 286 running DOS 3.0 at a blazing 12MHz. In 2006, he undertook training from the Imaging Science Foundation in video calibration and testing and thus started a passion for precise imaging that persists to this day. He is also a professional musician with a degree from the New England Conservatory as a classical bassoonist which he used to good effect as a performer with the West Point Army Band from 1987 to 2013. He enjoys watching movies and listening to high-end audio in his custom-built home theater and can be seen riding trails near his home on a race-ready ICE VTX recumbent trike. Christian enjoys the endless summer in Florida where he lives with his wife and Chihuahua and plays with orchestras around the state.