Overview

Most film-look plugins remap RGB values directly, the same way a LUT does. spektrafilm OFX, a free OFX plugin for DaVinci Resolve, does something slower and stranger: it treats your image as a stand-in for real light, rebuilds that light as a spectrum, runs it through modeled film layers with real sensitivity and density data, develops the result as a negative, exposes it again through a modeled print stage, and scans it back to RGB. Nothing in that chain is a shortcut lookup table.

The payoff shows up in the stock library. spektrafilm ships 17 camera-negative stocks and 9 print stocks and papers, covering Kodak Vision3, Portra, and Ektar alongside Fujifilm negatives, Kodak 2383/2393 print film, and Endura papers. Each profile is built from the manufacturer's own characteristic curves, spectral sensitivity data, and dye density measurements, not a colorist's guess at how the stock looked.

Grain is generated inside the same density space as the film development itself, so switching between 8mm, Super 8, 16mm, Super 16, 35mm, Super 35, 65mm, and 70mm changes grain size and texture the way it would on a real negative, instead of pasting a generic noise layer on top. The grain model is checked against measured RMS granularity curves, meaning it gets quieter in the tonal ranges where real film goes quiet and grittier where the emulsion actually varies. Halation works on the same logic: it simulates red-biased light scatter behind the emulsion before the image develops, so the glow around highlights changes with the film format you picked rather than staying fixed.

Camera and print-stage diffusion filters (Black Pro-Mist, Pro-Mist, Glimmerglass, CineBloom) simulate what those physical filters do to a lens before the negative ever sees the light. A LUT Generator exports the resulting look for dailies or a lightweight handoff, and a Process Negatives mode does the opposite: it takes real scanned film (Cineon/DPX, ADX10/16) and runs it through spektrafilm's print stage, closer to a virtual darkroom than a filter.

The plugin comes in two builds sharing one spectral engine. spektrafilm-flow exposes the essential controls for building a look fast; the full spektrafilm version unlocks printer calibration, DIR coupler tuning, and the deeper grain and scatter physics underneath. Presets carry over between the two, so a look built in flow drops straight into the full version for further refinement.

spektrafilm is built by Aedan, a German-American filmmaker based in Karlsruhe, on top of Andrea Volpato's original spectral-film research. Development has moved fast: recent updates added real-time 4K playback, RCM/ACES color management, and black-and-white stocks (Kodak Double-X, Tri-X). It runs natively on Apple Silicon and Intel Macs through Metal. A Windows build exists but is still in beta, and Linux isn't supported yet.