luminance property

double get luminance

Returns the luminance of the color

Implementation

double get luminance {
  final rgbMap = getRGBMap();
  double red = _getLinearValue(rgbMap["r"]! / 255),
      green = _getLinearValue(rgbMap["g"]! / 255),
      blue = _getLinearValue(rgbMap["b"]! / 255);

  return 0.2126 * red + 0.7152 * green + 0.0722 * blue;
}