contrast method

Color contrast([
  1. int amount = 100
])

Implementation

Color contrast([int amount = 100]) {
  final p = RangeError.checkValueInInterval(amount, 0, 100, 'amount') / 100;

  final luminance = computeLuminance();

  return luminance > 0.5 ? darken((p).round()) : brighten((p).round());
}