alpha post

[dvallez]

There was a post on here about how to make an alpha channel with a green screen background. Does anyone know the title of it or remember how to do it?

[7hbg]

Are you looking for this: Creating ‘transparent’ video using Chromakey?

[pjsssss]

Let me add once again , that this tip is brilliant. Everyone should look at this.

[tdtinker]

"In your Bin folder select the two files, right click on one of them and select 'Convert' and then 'Alpha matte...'. "


The Alpha matte is greyed out what did I do wrong?
tdtinker

[7hbg]

"In your Bin folder select the two files, right click on one of them and select 'Convert' and then 'Alpha matte...'. "


The Alpha matte is greyed out what did I do wrong?
tdtinker

Is your project ‘Rendering Format’ set to HQ?
Did you export the ‘source’ and ‘alpha’ files to HQ files?

If the two files were different (incompatible) in any way, I would expect the control to be disabled.