subtract method

Color subtract(
  1. Color other, [
  2. dynamic strength
])

Subtract the red, green, and blue channels of other from those of this Color. The resultant alpha is maintained from this, unless a strength would be specified which is used instead.

See alphaFromStrength for details on using a value between 0..1 or 2..255 as a shortcut for specifying alpha/opacity override.

Exposure method for - operator, providing strength.

Implementation

Color subtract(Color other, [dynamic strength]) =>
    withAlpha(alphaFromStrength(strength) ?? alpha) - other;