A pixel is the smallest resolvable rectangular area of an image, either on a screen or stored in memory. Each pixel in a monochrome image has its own brightness, from 0 for black to the maximum value for white (255 for an 8-bit pixel) . In a color image, each pixel has its own brightness and color, usually represented as a combination of red, green, and blue intensities (RGB).
Though Adobe Illustrator and PostScript can handle the importation of pixel-based image formats, such as TIFF, Adobe's first dedicated raster graphics editor was Photoshop 1.0, released in February 1990.
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