Color-Utilities

A color utilities class that converts RGB to XYZ or CIELAB color spaces and measures the color difference (Delta-E)

Important Notes

• Constructors can take 8-bit RGB format or float format (0.0 to 1.0) as shown in the Instructions section below
• Calculations are quasimetric!
• The conversions calibrate the RGB color to 2° with illumination D65
• Delta-e is calculated using CIE76, which may be validated using this link

Usage

• ColorUtils mainly aims at calculating Delta-E for any two given RGB colors
• Since the RGB color space is not perceptually uniform, a couple of conversions are needed in order to compare the colors, thus introducing the conversion functions to the class

Instructions

Constructing Colors

ColorUtils::rgbColor c1(static_cast<unsigned int>(255), 255, 255);  // unsigned int constructor
ColorUtils::rgbColor c2(static_cast<float>(0), 0, 0); // float constructor

ColorUtils::xyzColor cX1(static_cast<float>(255), 0, 0); // float constructor

ColorUtils::CIELABColorSpace cC1(static_cast<float>(255), 255, 255); // float constructor

RGB to XYZ Converter

ColorUtils::xyzColor cX2 = rgbToXyz(c1);  // cX2 contains the XYZ value of c1 (white)

XYZ to CIELAB Converter

ColorUtils::CIELABColorSpace cC2 = xyzToCIELAB(xyzColor cX1); // cC2 contains the CIELAB value of cX1 (red)

Delta-E Calculator

float deltaE = getColorDeltaE(rgbColor c1, rgbColor c2);  // deltaE = 100.0

Task List

• Overload the public functions for better compatibility
• Add more color spaces support (such as CMYK and other variations of RGB)
• Overload arithmetic operators for each color space
• Add an option to use dE2000

Feel free to make a pull request or request more features!

License

MIT