7a54d9a1_ress__Film_Effects__G_Vignette__Notes
[Control] Vignette Background [Settings] Colour A on White Colour A on Black Colour A on Grey Colour A on Colour B [Notes] 
Because of the blending modes that can be used, you can choose to use the primary colour on white (good for multiply mode), black (good for screen or add mode) and grey (good for overlay mode). The final option allows you to use both the primary and secondary colour to make the vignette effect.
Nattress: Film Effects: G Vignette
Notes