Delta, the fourth letter of the Greek alphabet and symbolized as a triangle, is used in science to indicate difference. Commission Internationale de l’Eclairage (CIE), a non-profit organization considered to be the authority on the science of light and color, has defined color spaces, including CIE XYZ, CIE L*a*b*, and CIE L*C*h, for communicating and expressing object color. As a comparison, the Adobe Wide Gamut RGB color space encompasses 77.6% of the visible colors specified by the Lab color space, whilst the standard Adobe RGB color space covers just 50.6%. Delta E is the difference between two colours designated as two points in the Lab colour space. Often the gamut will be represented in only two Figure 4.7 Lab Colour Space. Delta, the fourth letter of the Greek alphabet and symbolized as a triangle, is used in science to indicate difference. If I photograph, film or work with very saturated colours, for example with the HDR technique, I need so-called wide gamut spaces (larger than the sRGB like the ProPhoto). If you have skin color, then you have a boomerang shaped gamut and no simple thresholding in any color space will get it. Identifying Color Differences Using CIE L*a*b* Coordinates. These routines convert images back and forth from RGB to CIELAB color spaces. A colour gamut is the area enclosed by a colour space in three dimensions. Colors in the L*a*b* color space can exist outside the RGB gamut (the valid set of RGB colors). The L*a*b* color space provides a more perceptually uniform color space than the XYZ model. A good color space is the space I need for my photo ! Delta E is the difference between two colours designated as two points in the Lab colour space. Output from Lab2RGB is always between 0 and 1. A matrix RGB color space is also defined in terms of its Tone Response Curve ("TRC" for short). A color space can be described as a method for expressing the color of an object using some kind of notation, such as numbers. YIQ Color Space 17 R´ = Y + 1.140V G´ = Y – 0.395U – 0.581V B´ = Y + 2.032U For digital R´G´B´ values with a range of 0– 255, Y has a range of 0–255, U a range of 0 to Defined by the Commission Internationale de l’Eclairage (CIE), the L*a*b* color space was modeled after a color-opponent theory stating that two colors cannot be red and green at the same time or yellow and blue at the same time. A matrix RGB color space is defined in terms of the location of its RGB primaries in the XYZ reference color space, which in turn determines its respective size (volume) and shape in the LAB reference color space. Color management systems use Lab as a color reference to predictably transform a color from one color space to another color space. The Lab Color mode has a lightness component (L) that can range from 0 to 100. 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