What's the difference between the Add and Linear Dodge blend modes in After Effects? Aren't they the same thing? The user guide page isn't of much help because it doesn't specify the differences in the math used for these two modes, but from what I understand, Linear Dodge is Add in Photoshop for example (hence the label "Linear Dodge (Add)"), and from what I see they behave exactly alike in After Effects.
The difference is the way two these modes behave when a layer isn't fully opaque.
Linear Dodge behaves as lowering Opacity in Photoshop, while
Add behaves as lowering Fill. I believe they're separated in AE because there's no Fill parameter in it. I think it's the same for
Classic Color Dodge and
Classic Color Burn