A lightbox is a device consisting of a box with fluorescent tubes balanced for white light, covered with translucent glass or plastic. It is used by photographers and film technicians to view, register, or correct film negatives and positives with accurate and consistent lighting.
Understanding how to use a lightbox is essential for tasks such as examining negatives, aligning images for printing, or performing retouching and colour correction. A properly lit lightbox ensures accurate evaluation of detail, exposure, and colour, making it a vital tool in both traditional darkroom and modern photographic workflows.