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Using OFX Alpha Channels (Legacy)
Now that all effects use standard color corrector nodes, the OFX Alpha is always available without having to manually set a menu option. There is no need for the user to do anything else to access an OFX Alpha moving forward from DaVinci Resolve 18.5.
However, for legacy project use there is still an OFX Alpha menu with two options.
— Enable: On by default. When this is unchecked, even if the effect generates an Alpha, the Alpha is ignored. Why one would go to the bother of generating an effect with an Alpha channel, only to discard it completely is a matter of conjecture, but the option is there if you’re doing something exceedingly strange and complicated. Really just leave this on.
— Use For Mixing: On by default. When unchecked, no mixing of the Alpha happens on the node at all. Power Windows and Keys stop working, and the node behaves like a legacy FX node. Any Alpha generated is still output, it just doesn’t limit where the effect acts.
The Use OFX Alpha option has been replaced with the OFX Alpha menu. You most likely want to keep both Enable and Use for Mixing checked unless you have a really good reason.