You won't be surprised to learn that the human eye works in rather a different way to an LCD panel. An LCD panel displays brightness levels in a linear progression of equal digital steps, but the eye's sensitivity to brightness differences is non-linear - that is, it's more sensitive to differences between darker shades than it is for brighter ones. If the eye's response to shades of brightness from black to white is plotted on a graph, it follows a curve called a gamma curve. In order for the output of an LCD display to mimic this curve - so that it displays shades with the correct levels of brightness as perceived by the eye - its output needs to be adjusted with a gamma correction. Without gamma correction, a display would appear to only show a limited number of shades, since the subtle gradations between many shades would be lost.

Gamma correction addresses the problem of the non-linear brightness response of the eye, but it doesn't do anything about the accuracy of the actual colors. To fix this, color temperature correction is needed. If you've ever looked at several LCD panels side-by-side while they're displaying a pure white screen (in a shop, perhaps), you might have noticed subtle variations in tint between them. We fix this problem by adjusting the tint of a pure white screen to a fixed, standard value on all our ASUS Splendid displays: this value is called the color temperature.

ASUS Eye Care mode is very different from other blue-light reduction systems. Rather than using a simple yellow filter applied to the entire image, ASUS Eye Care mode reduces blue light on a per-pixel basis - very similar to the technology we use in Vivid mode. The colors in each individual pixel are analyzed to see whether any blue light is present, and if there is, the intensity is reduced.