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If we take the color coordinates from each color gamut from Table 1 and calculate the area of each color gamut, we can find that the area ratio of sRGB to NTSC is 0.72 to 1. Some panel manufactures or display brands market their monitors as “72% NTSC” in terms of color gamut, claiming to be “sRGB compatible”. In the display industry, there is also another piece of misleading information. For example, (x, y) = (0.64, 0.30) is not equal to (x, y) = (0.63, 0.29), even though the numbers are very close to each other. Each pair of color coordinates specifies a distinct or unique color. This help system contains proprietary information which is protected by copyright.However, in order to achieve color fidelity or color management, the exact RGB color coordinates on the chromaticity diagram must be agreed upon. The information contained in this help system is subject to change without notice.
#CIE COLOR CALCULATOR SOFTWARE SOFTWARE#
The sample and standard as described in a polar coordinate system.Ĭopyright © LabCognition, Analytical Software GmbH & Co. The ∆H* is the difference in hue angle between The difference in chroma between the sample and standard as described That are related to this scale, ∆C* and ∆H*. In addition, there are two other delta values Negative ∆b* means, the sample is bluer than the standard Positive ∆b* means, the sample is yellower than the standard Negative ∆a* means, the sample is greener than the standard Positive ∆a* means, the sample is redder than the standard Negative ∆L* means, the sample is darker than the standard Positive ∆L* means, the sample is lighter than the standard
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L*a*b* color differencesĬolor differences will be measured as total difference of the L*, a*Īnd b* values of a sample and the standard using the following equations: (perfect reflecting diffuser) that was used for the calculation of X, Y,Īnd Z of the sample. The quantities L*, a*, and b* are obtained from the tristimulus valuesĪccording to the following transformations:Īre the tristimulus values of the illuminant Samples for which a* = b* = 0 areĪchromatic and thus the L*-axis represents the achromatic scale of greysįrom black to white. The other two coordinates a* and b* represent redness-greenessĪnd yellowness-blueness respectively. The L*-axis is known as the lightness and extends from 0 (black) toġ00 (white). Notes are principally concerned with the latter known as CIE 1976 L* a*ĬIELAB allows the specification of color perceptions in terms of a three-dimensional The other model was the CIEġ976 L*u*v* color model being described in more detail below. Intended for use with self-luminous colors and the other was intendedįor use with surface colors. In fact in 1976 the CIE specified two color spaces one of these was In the specification of one of these transformations as the CIE 1976 L* Of non-linear transformations of the CIE 1931 XYZ space and finally resulted The need for a uniform colour space led to a number Problem if we wish to estimate the magnitude of the difference between Secondly, the XYZ system and the associated chromaticityĭiagrams are not perceptually uniform. Of the psychophysical dimensions of color perception namely, brightness, Firstly, this specification is not easily interpreted in terms Of two problems with the specification of colors in terms of tristimulus Is based on the CIE 1964 color model which was further enhanced because