HDR Effect was quite a bit off from the sRGB standard, enough so that we recommend avoiding it. But after working in that mode for a while, we found it preferable because it imparts a more natural look. The Rec.709 mode showed similar behavior with lower luminance, which made images seem muted by comparison. It didn’t impact depth or detail quality but it did make the image a tad more vivid, not a bad thing. Luminance levels were a little high, which takes errors just over the visible level. Secondary colors were a little off-hue thanks to the too-blue white point, but saturation is the more significant metric in this test. In the first chart, representing Custom mode at default settings, you can see that primary color points were right on the money. The 27UK850’s color gamut and luminance accuracy was the one area that met expectations. Ultimately though, our settings delivered the best possible image. You can’t switch back and forth between gamma presets without also re-calibrating grayscale. We also discovered this setting interacts with the RGB sliders, so we had to readjust them. We recommend using HDR modes for actual HDR content only.Īfter calibration, we preferred a slightly darker gamma, so we switched from Mode 2 to Mode 3. A common example we saw was “floating-head syndrome,” which is when faces appear to hover against a formless black background. While that may look good to some, we noticed detail clipping. It darkened shadow areas and brightened highlights to increase the perception of contrast. HDR Effect skewed gamma much like a dynamic contrast option would. We’d prefer to see it conform to BT.1886, but very few monitors offer that option. The Rec.709 mode tracked almost perfectly with the 2.4 power function. This also affected color saturation tracking, so it should be addressed. The first gamma chart, the 27UK850’s Custom mode, shows that the default contrast setting was too high.
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