maxContrast method
Returns the color (a or b) with the highest contrast to this color.
Implementation
Ray maxContrast(Ray a, Ray b) {
final lum = luminance;
final lumA = a.luminance;
final lumB = b.luminance;
final contrastA = (lum - lumA).abs();
final contrastB = (lum - lumB).abs();
return contrastA > contrastB ? a : b;
}