Roto shapes not adhering to Alpha Channel views like tutorials?

[iku.tri]

While following along with the tutorials, I see the presenter tap “A” for the alpha channel view mode cycle, but I don’t seem able to have my roto bezier curve / x curves / etc effect them. Here is a screen grab of what I see and the tutorial for comparison.

I assume there’s some user error on my part, is there something I need to adjust to get it working?

[marco]

@iku.tri Your source image has opaque alpha, so please do the following:

• Select the source in the Trees window
• In the Node window, change the Alpha > Fill to Transparent

[iku.tri]

That worked, thank you!