lighten method
Makes the color lighter.
The higher the value(0.0 - 1.0), the lighter the image becomes.
Implementation
Color lighten([double amount = 0.1]) {
assert(amount >= 0 && amount <= 1);
final hsl = HSLColor.fromColor(this);
final hslLight =
hsl.withLightness((hsl.lightness + amount).clamp(0.0, 1.0));
return hslLight.toColor();
}