Display, Projection & Legibility

Category first: BDM vs. ADM

Before any number, decide what the audience does with the image, because that choice sets size, distance, and contrast. Basic Decision Making (BDM) means the viewer comprehends content — reads the slide, follows the keynote, sees the product — without needing every pixel; most corporate and live-event screens are BDM. Analytical Decision Making (ADM) means the viewer must resolve every element of detail (medical imaging, CAD, forensic, fine-art reproduction). When in doubt for a general audience design to BDM; if anyone must read fine detail to do their job, it is ADM.