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A pixel (an abbreviation for picture element)

[is] the smallest discrete part of a video image, the size of which is controlled by the analog-to-digital conversion sampling process and subsequent other compression processes. The more picture elements per line, the higher the resolution of the image.
[c]onverts the input light image to an electronic signal. The smallest discrete picture element that can be transmitted using the video or still image coding algorithms. A pixel is similar to grains in a photograph or dots in a halftone. Each pixel can represent a number of different shades or colors, depending on how many bits are allocated for it.[1]


  1. Unified Capabilities, Framework 2013, App. C, at C-35 (full-text).