Nx 3-Strip is a color effect for DaVinci Resolve from Nx Color that reconstructs the Technicolor Process IV, built from film physics rather than a LUT. It aims for the dense, dimensional look of three-strip photography through emulation of the process itself.
The result carries narrow-band color separation that carves each hue clean, dense and heavy saturation where saturated colors darken rather than brighten, and rich color contrast with an oil-paint sense of dimensionality. Skin reads with golden tones from cyan dye impurity, highlights take on an ivory cream tone, and shadows run cool while highlights run warm — the imbibition trapping signature. Deep, structured blacks, organic highlight rolloff and density-dependent grain round out the film character.
Nx 3-Strip is at version 2.2 and works with DaVinci Resolve 21, 20 and 19. It's listed here as free; check the developer's page for current licensing.