(W)OLED Gamut Correction

(W)OLED Gamut Correction

(W)OLED displays have very unique colourimetry, with issues associated with metameric failure, which we address within the Perceptual Matching page of the website.

But another unique aspect of (W)OLED displays is that they maintain near full saturation (gamut) all the way down to black.

Alternative display technologies, including traditional CRT and LCD displays, as well as projectors, have a de-saturation effect as the luma levels drop below about 20% peak luma, depending on the actual display.

This is also in-line with the operation of the human visual system, where the eye's ability to see colour drops as the level of available light causes the colour sensitive cones to cease working, due to their lower sensitivity compared to the eye's monochrome sensitive rods.

Using the unique 3D CIE graphs of ColourSpace this issue can be easily displayed, with the following graphs showing the desaturation in an LCD displays, compared to the lack of desaturation in a (W)OLED, looking at Red Primary only.

LCD & CRT displays show progressively lower gamut (saturation) as the luma levels drop, in this case starting at around 50% of peak Red luma.

(W)OLED displays maintain saturation all the way down to black, which can cause the viewer to perceive the displayed image as being unnatural, with Red appearing very saturated near black in the above case.

Understanding this phenomena of (W)OLED displays means we have to adapt their calibration to better mimic more traditional displays, by introducing a degree of desaturation in the displays lower luma levels.

The available LUT Tools Filters can be used to apply a low-light desaturation, matching the effect on all other display technologies.

Using the Mono Blend filter, Gamut Reduction can be applied to nay selected range within the calibration LUT. Very uniquely, the gamut reduction can be set independently for the three RGB colour channels as required, as shown above.