HDR is what OLEDs do best. Their naturally infinite dynamic range is a real asset. The 27QHD240 delivers typical performance for the category.
HDR Brightness and Contrast
Corsair claims 1,000 nits for the 27QHD240 when measuring a 3% window pattern. I cannot replicate this, but I measured a 25% window at over 800 nits, so I have no doubt as to this monitor’s capabilities. The Flex and the 27-inch Asus are a tad brighter, but there is no discernible difference when viewing actual content. The bottom three monitors are a bit dimmer overall but still deliver tons of depth and color saturation. Of course, all the panels have infinite HDR contrast thanks to their unmeasurable black levels.
Grayscale, EOTF and Color
The 27QHD240’s superb color accuracy extends to its HDR grayscale tracking, which is without visual error. There is a slight rise in blue levels as the image brightens, but this does not adversely affect the image. The EOTF tracks close to the reference line except for its slightly early transition to tone-mapping, which is a minor issue.
Color tracking is slightly off the mark at the inner saturation points though it gets closer to targets as saturation increases. Secondary colors are off hue as well. Magenta and cyan are a bit cooler than they should be and yellows have a slight green tint. In content, it’s at the level where the viewer can sense that something’s not quite perfect but can’t tell exactly what. Some tweaking of the 27QHD240’s firmware could resolve this though I cannot call myself dissatisfied, and I doubt any users will complain. Contrast and color saturation are so good that they mitigate these measured errors.
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