cied2000

The CIEDE2000 color difference calculation function is a C++ function that determines the color difference between two colors by converting their coordinates to a new chromaticity space and then calculating the deltaLPrime, deltaCPrime, and deltahPrime values. The function returns the CIEDE2000 color difference value based on these calculated values.

This code provides functions for color space conversions, including RGBtoXYZ, XYZtoLab, and rgb2lab, which transform RGB values into Lab* color space according to CIE XYZ and Lab specifications. The code uses C programming language and assumes RGB values are in the range [0, 255] and XYZ values are in the range [0, 1].

The testCIED2000 function calculates the CIEDE2000 color difference between two colors, "red" and "darkred", using the rgb2labRet and CIEDE2000 functions, and logs and asserts the result. The function is designed to test the accuracy of the color difference calculation, and returns the calculated value.