Pixel

In digital imaging, a pixel, pel, or picture element is the smallest addressable physical element of a raster image or the smallest controllable element of a display device or dot matrix printer. In most digital display devices, pixels are the smallest element that can be manipulated through software.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

PIXCS

The photo-editing numbers, made simple — free calculators for image resizing, aspect ratios, DPI and print size, megapixels, file size, and aspect-ratio cropping, plus plain-English guides to resolution, file formats, color, and the basics of editing software.

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