OptionalenabledOptionalintensityDarkening strength at the corners, 0..1 (0 = none). Default 0.5.
OptionalsmoothnessFalloff width from frame edge toward center, 0..1. Larger = softer / starts closer to the center. Default 0.5.
Optionalroundness1 = perfectly circular, 0 = stretched to the frame's aspect. Default 1.
OptionalcolorColor the corners are tinted toward. Default black [0,0,0].
Radial corner-darkening vignette.