Emerging artists are frequently asked to submit slides and/or transparencies to gallery owners, competition judges, publishers and others. Which do you need? It depends on how you’re going to use these samples. Both are made from the same material—a positive, transparent film—so the difference is in the size. Slides are simply 35mm-sized transparencies that come in handy cardboard or plastic frames. Because of their portability and ease in viewing through a projector or on a light table, most gallery owners and competition sponsors prefer this format. Transparencies usually come in larger sizes, such as 2 1/4″, 4×5″ or larger, and are the recommended format for making fine art-quality reproductions.