I'm trying to export my project as an inverted alpha mask to a quicktime movie. I'm selecting inverted alpha from the channels drop down and this visually gives me what I want to export, but I can't get what I see to export correctly. I don't see a Negative or invert option in the export/options area.
Does anybody know how I can get this result?
In general, making changes to the Channels pop-up menu at the top of the Canvas just changes your view of the project, not how it is exported.
You can export the Alpha by going to the Output tab of the Export Options (File > Export), and choosing Alpha from the Color pop-up menu. Inverted alpha is not an option, so you'll just have to invert the result.
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