Tue Jul 10, 2018 2:09 pm
There's actually a checkbox in the Export tab of the Saver: 'Save Alpha to Color.'
edit: But since you really need to understand Channel Booleans, you have first the Operation, which in its default Copy mode will do what you want. The channel list tells you exactly what is going to happen:
Copy To Red: <channel>. So to put the Alpha in the red channel, you'd just set the 'To Red' control to Alpha BG. Thus, Copy To Red: Alpha Background.
Suppose you have two alphas that you want to intersect—a classic Boolean AND. Set the Operation mode to And (or Multiply—mathematically they're identical), and set To Alpha: Alpha FG. The result is Alpha BG * Alpha FG.
Bryan Ray
http://www.bryanray.name
http://www.sidefx.com