A diapositive is a photographic term for a positive image created on a transparent support, such as film or glass, intended to be viewed with transmitted light. Unlike a negative, which reverses tones, a diapositive displays the scene's true colours and brightness exactly as captured.
Diapositives are commonly used for slides, projections, and archival purposes, offering high-quality, sharp images with rich detail. They are valued by photographers for their colour fidelity and clarity, making them ideal for presentations, exhibitions, and professional reproduction. The term is often interchangeable with "transparency" in both traditional and modern photography contexts.