What forms a digital image?

• A. Phosphor screens
• B. Pixels
• C. Analog film
• D. Photographic paper

Answer: (D)

A digital image is formed by pixels—the tiny picture elements arranged in a grid. Each pixel holds a color or brightness value, and the collection of all these values across the grid creates the full image you see. When a camera captures light or a file is created, the scene is sampled into many discrete pixels, and those samples are stored digitally. Display devices or printers then reproduce the image by rendering those same pixel values.

Phosphor screens are just the light-emitting layer in older CRTs and don’t define the image data themselves. Analog film and photographic paper store or reproduce light in continuous, chemical ways rather than as discrete digital samples. So the essential unit that forms a digital image is the pixel.