- Posts: 3
- Joined: Sat Oct 31, 2015 12:48 pm
Subtract is not what you want.
You are looking for Multiply by alpha (invert radio control on)
Many applications, use the term 'subtract' very loosely, as it resonates with users much more so than multiply by alpha. But what they are in fact doing, is exactly that.
see the difference with 2 soft edge ellipses crossing each other.