Persistence

Simulates phosphor afterglow: bright content lingers and decays instead of updating instantly frame to frame.

Parameter	Control	Range	Notes
Amount	Trough	0 to 1	0 fully bypasses the effect.

The R:G:B decay-time ratio (1.6 : 1.0 : 0.45, matching a real shadow mask tube’s phosphor chemistry) is fixed and not user-exposed.