What is an analog image?

Answer 1

Analog Photography From Wikipedia, the free encyclopedia

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Analog Photographic film - 1980s-1990s years

Analog photography is a commonly used term for photography that uses a progressively changing recording medium, which may be either chemical process based (e.g.,photographic film or plate) or electronic (e.g., vidicon or CCD sensor). Through common use this term has come to mean anything that is "not digital" despite some amount of controversy that the use of film isn't a true "analog" process.[1][2]

In a film camera that uses the gelatin-silver process, light falling upon photographic emulsions containing silver halides is recorded as a latent image. The latent image is subjected to photographic processing, which makes it visible and insensitive to light.

In a video camera or digital still camera, the signal is captured with a video camera tube orcharge coupled device sensor, which sends the picture to be processed by the camera's electronics. The signal can be transmitted or recorded on a storage device for later playback.

Answer 2

analog image is a two dimensional function of f(s,t) considered in the continuous time domain.