picture element


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picture element

[′pik·chər ‚el·ə·mənt]
(electronics)
That portion, in facsimile, of the subject copy which is seen by the scanner at any instant; it can be considered a square area having dimensions equal to the width of the scanning line.
In television, any segment of a scanning line, the dimension of which along the line is exactly equal to the nominal line width; the area which is being explored at any instant in the scanning process. Also known as critical area; elemental area; pixel; recording spot; scanning spot.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

picture element

(graphics)
(pixel) 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 (e.g. 255 for an eight-bit pixel) for white. In a colour image, each pixel has its own brightness and colour, usually represented as a triple of red, green and blue intensities (see RGB).

Compare voxel.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

pixel

(1) (Pixel) See Chromebook Pixel, Pixel phone and Pixel C.

(2) (PIX [picture] ELement) The fundamental display element of an electronic screen or bitmapped image. Screen resolution is rated by the number of horizontal and vertical pixels; for example, 1024x768 means 1,024 pixels are displayed in each row, and there are 768 rows (lines). Likewise, bitmapped images are sized in pixels: a 350x250 image has 350 pixels across and 250 down.

Pixels and Subpixels
In monochrome systems, the pixel is the smallest addressable unit. With color systems, each pixel contains red, green and blue subpixels, and the subpixel is the smallest addressable unit for the screen's electronic circuits. The software addresses the pixel, and the hardware addresses the subpixels that make up the pixel. For more on the red, green, blue concept, see RGB.

Pixel Structures
In storage, pixels are made up of one or more bits. The greater this "color depth" or "bit depth," the more shades or colors can be represented. The most economical system is monochrome, which uses one bit per pixel (on/off). Gray scale and color typically use from four to 24 bits per pixel, providing from 16 to 16 million colors. See color depth.

Displaying the Pixel
On a display screen, pixels are either phosphor or liquid crystal elements. For monochrome, the element is either energized fully or not. For gray scale, the pixel is energized with different intensities, creating a range from light to dark. For color displays, the red, green and blue subpixels are each energized to a particular intensity, and the combination of the three-color intensities creates the perceived color to the eye. For subpixel details in an LCD screen, see LCD subpixels. See screen resolution, vertex shader and bad pixel.


A Monochrome Bitmap
The simplest pixel representation is a black and white monochrome image in which one bit represents one pixel. Monochrome CRTs use white, green or amber phosphors as a single color over a gray/black screen background.







Color is Always RGB
Red, green and blue make white. Upon close inspection, one can see that the red, green and blue subpixels on this LCD screen are lit, creating the white pixels for the numeral nine.







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References in periodicals archive ?
The dots receive their semiotic character as picture elements related to one another only in the overall image.
Another important consideration is the number of pixels (picture elements) an HDTV can display.
Each data image contains millions of tiny picture elements, or pixels.
The tiniest dots of color you see on your computer or television screen are called picture elements, or pixels for short.
Ungroup the object twice, whereupon all picture elements will be selected.
They consist of picture elements, or pixels--computer codes consisting of bits of information representing specific colors, intensities, and locations.
UXGA Microdisplays - Applying its fiber-optic taper technology, eMagin effectively tiles microdisplays to create UXGA (over 5.7 million individually controlled picture elements, each with high speed 256-gray level capability per color) and larger displays.
Digital zoom artificially enlarges the camera's picture elements, or pixels, but doesn't improve the image's resolution.
Camera Basler A402k Sony XCHR58 Characteristics Image Device CMOS CCD Nominal Camera 1/2" Size Picture Elements 2,350 X 1,720 782 X 582 Image Size SVGA 767 X 580 Pixel Size 7.0 [micro]m square Approx.
Other big picture elements could have included a correlation of the Texas events portrayed against a timeline for World War II in general, graduation rates vs.
The new product, featuring a wide LC display with some 1.57 million picture elements, will mark Sanyo's entry into the market for home-use LC projectors.
This light-sensitive chip measures the intensities of the red, green and blue components of the light as they fall on the picture elements (pixels) on the chip and outputs the light intensity pattern as a digital image.