So modes work on the way in, but if you want to write a layered PSD file out (Composition>Save Frame As> Photoshop Layers), there are a few modes that are not supported. After Effects will substitute the closest equivalent if you've used the following modes.
Dancing Dissolve | > | Dissolve |
Classic Color Burn | > | Color Burn |
Add | > | Linear Dodge |
Classic Color Dodge | > | Color Dodge |
Classic Difference | > | Difference |
Stencil Alpha | > | Not supported |
Stencil Luma | > | Not supported |
Silhouette Alpha | > | Not supported |
Silhouette Luma | > | Not supported |
Alpha Add | > | Not supported |
Luminescent Premul | > | Not supported |