An image formed by recording a continuous changing signal is known as?

• A. Analog
• B. Digital
• C. Raster
• D. Matrix

Answer: (A)

An image formed by recording a continuous changing signal is analog because analog imagery preserves the uninterrupted variation of the original signal in the recording. The values change smoothly over time or space, without deliberate steps. Digital imaging, by contrast, samples the signal at discrete intervals and quantizes the amplitude, producing a grid of discrete levels. The terms raster and matrix describe how digital image data is arranged or stored—a grid of picture elements or a two-dimensional array—not the nature of the signal itself.