An enlarger is a specialized transparency projector used to produce photographic prints from film or glass negatives using the gelatin-silver process, or transparencies. All enlargers consist of a light source - normally an incandescent light bulb, a holder for the negative or transparency and a specialised lens for projection. The light passes through a film holder, which holds a photographic negative or transparency, having been previously exposed in a camera and developed. Prints made with an enlarger are called enlargements. Typically, enlargers are used in a darkroom, an enclosed space from which extraneous light may be excluded; some commercial enlargers have an integral dark box so that they can be used in a light-filled room.

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