Tri-colour filters are photographic filters that allow light in three primary colours-red, green, and blue-to pass through. They are primarily used in the additive method of colour printing, where the combination of filtered light creates a full-colour image.
Photographers and printmakers use tri-colour filters to control colour balance, correct colour casts, and accurately reproduce scenes in colour photography. Mastery of these filters ensures precise colour rendering and high-quality prints, making them essential tools in traditional and experimental colour photographic processes.