Pixel

Technology / Computers / Pixel: Short for Picture Element, a pixel is a single point in a graphic image. Graphics monitors display pictures by dividing the display screen into thousands (or millions) of pixels, arranged in rows and columns. The pixels are so close together that they appear connected. The number of bits used to represent each pixel determines how many colors or shades of gray can be displayed. For example, in 8-bit color mode, the color monitor uses 8 bits for each pixel, making it possible to display 2 to the 8th power (256) different colors or shades of gray. On color monitors, each pixel is actually composed of three dots -- a red, a blue, and a green one. Ideally, the three dots should all converge at the same point, but all monitors have some convergence error that can make color pixels appear fuzzy. The quality of a display system largely depends on its resolution, how many pixels it can display, and how many bits are used to represent each pixel. VGA systems display 640 by 480, or about 300,000 pixels. In contrast, SVGA systems display 1,024 by 768, or nearly 800,000 pixels. True Color systems use 24 bits per pixel, allowing them to display more than 16 million different colors.

Effective Pixel Count

Technology / Digital Cameras / Effective Pixel Count: There are two different ways to think about the pixels on a camera's image sensor. 'Actual' pixels is a simple count of every pixel present on the sensor. 'Effective' pixels, however, is a count of al MORE

Megapixel (MP)

Technology / Digital Cameras / Megapixel (MP): One million pixels. The more megapixels a camera has, the higher its maximum resolution — and the better its potential picture quality. MORE

Pixel Size

Science / Spiders / Pixel Size: the number of Angstroms per pixel in the digitized micrograph. Pixel size is computed as ps (A/p) = [10,000(A/u) * SR(u) * DF] / M, where ps = pixelsize, SR = scanning resolution, DF = decimation fact MORE

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