Last week, we discussed
the importance of look-up tables that have more than eight bits and this week, we're staying with the look-up table theme, making 3D-LUT our focus.
Some high-end LCD monitors, such as the EIZO ColorEdge CG242W, take the LUT concept even further by using a 3D-LUT. A 3D-LUT is a three-dimensional LUT blending each RGB colour (i.e., a three-dimensional table assigning R, G, and B to each of three axes). A traditional LUT system has one LUT for each RGB colour and refers to the LUT for each RGB colour when displaying a certain colour and calculating the target colour using the three RGB colours from each LUT.
Since the 3D-LUT includes points of intermediate gradations blending R, G, and B, it offers improved color representation for intermediate gradations and improved gray-scale accuracy.
3D-LUTs also shine when converting color gamuts in a colour-management environment. They make it possible to reallocate the approximately 16.77 million colours allocated to one colour gamut to another colour gamut with high precision, minimising the loss of information from the original colour gamut.
In addition, since the 3D-LUT offers improved colour reproduction from RGB blending, the user's manipulations and colour adjustments generally have the expected results with respect to parameters such as brightness, chroma, and hue. Perhaps this is the most important aspect of performance for an LCD monitor used in colour management, which above all else requires accurate colour reproduction.
Visit the EIZO UK
website for more information on the ColorEdge range.