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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 45GR75DC supports HDR10 signals with an automatic switch. It’s rated for DisplayHDR 600, which is unusual for a VA monitor. It is brighter than most of the competition.
HDR Brightness and Contrast
At over 800 nits, the 45GR75DC blows well past its 600-nit rating. The Samsung takes the top spot with its edge/zone dimming backlight that’s good for over 1,300 nits peak when measuring a 25% window pattern. Its main draw is a very aggressive dynamic contrast feature that gives it infinite contrast due to an unmeasurable black level. The LG is well in the hunt, though, with almost 20,000:1. Its HDR rendering is superb, with deep blacks, bright highlights and vivid color. This is excellent performance.
Grayscale, EOTF and Color
The 45GR75DC retains access to picture modes for HDR content. Gamer 1 is the best choice, as you can see from the charts. Grayscale tracking is visually perfect with all errors at or under 3dE. The EOTF starts a tad dark, then lightens up to the tone-map transition at 70%. I ran these tests in all three dimming modes and got the best performance from normal. It’s the most accurate and delivers the highest overall contrast.
In the HDR color tests, you can see a bit of over-saturation in the inner red targets and slight magenta hue errors with near-perfect performance from the other colors. Gamut coverage only comes up a tad short in the green primary. It makes a solid attempt at covering Rec.2020 as well. Inner points are a bit over-saturated, which is forgivable. Color runs out at around 85% for red, 65% for green and cyan and 95% for blue and yellow. This is typical of premium wide gamut monitors. The 45GR75DC’s overall HDR color accuracy is excellent.
Test Takeaway: With an effective dynamic contrast feature, the 45GR75DC delivers very high contrast in HDR mode. With solid grayscale, EOTF and gamut accuracy, it renders a superb HDR image. It isn’t quite an OLED, but it’s well ahead of most of its competition in quality.
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