-
I tried Shift Channels on a blue stroke to change it to alpha, but nothing happened. What’s wrong?
I made this blue S, https://imgur.com/0JPwunu
with the rotobezier and a stroke effect. Now I want to change the blue to alpha, and Shift Channels doesn’t seem to do anything when I say take the alpha channel from the blue channel.
That’s the only blue thing on the screen, I don’t get the confusion. I expect the blue to become transparent…
-
2 Replies
-
Wait a minute, I’m an idiot. In my hours of frustration and doing tests with the color channels of different sources, I failed to realize that white is a pure combination of ALL colors, including blue.
And that the exact same effect is achieved with “Reveal Original Image” (on stroke options) + Invert Channels set to Alpha.
-
Thanks for reporting back what worked for you.
———————————————————————————————————
Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
———————————————————————————————————
Reply to this Discussion! Login or Sign Up