SUMMARY
Fujifilm's in-camera Grain Effect, found in the IQ menu, applies to JPEG and HEIF files and is distinct from post-processing grain plugins. The X-T5 and newer models feature separate roughness and size controls, while older bodies only have roughness. Unlike static plugins, Fujifilm's grain is tuned to film simulations and scales with ISO, potentially masking digital noise at higher sensitivities. This effect is applied before sharpening, allowing for reduced sharpness combined with weak, small grain for a smoother texture. Special care is advised with the ACROS simulation due to its built-in grain, and the Strong/Small combination is generally best avoided.
TAKEAWAYS
Fujifilm's Grain Effect is applied in-camera to JPEGs/HEIFs, not RAW files.
Controls for roughness and size offer more nuanced application than typical plugins.
Grain integrates with film simulations and ISO, masking digital noise at higher sensitivities.
Consider cropping plans when selecting grain size, as it's locked at capture.