Pixel

In digital imaging, a pixel, or pel, (picture element) is a physical point in a raster image, or the smallest addressable element in a display device; so it is the smallest controllable element of a picture represented on the screen. The address of a pixel corresponds to its physical coordinates. LCD pixels are manufactured in a two-dimensional grid, and are often represented using dots or squares, but CRT pixels correspond to their timing mechanisms and sweep rates.

Each pixel is a sample of an original image; more samples typically provide more accurate representations of the original. The intensity of each pixel is variable. In color image systems, a color is typically represented by three or four component intensities such as red, green, and blue, or cyan, magenta, yellow, and black.

In some contexts (such as descriptions of camera sensors), the term pixel is used to refer to a single scalar element of a multi-component representation (more precisely called a photosite in the camera sensor context, although the neologism sensel is sometimes used to describe the elements of a digital camera's sensor), while in others the term may refer to the entire set of such component intensities for a spatial position. In color systems that use chroma subsampling, the multi-component concept of a pixel can become difficult to apply, since the intensity measures for the different color components correspond to different spatial areas in such a representation.

The word pixel is based on a contraction of pix ("pictures") and el (for "element"); similar formations with el for "element" include the words voxel and texel.

Read more about Pixel:  Etymology, Technical, Megapixel, Display Resolution

Other articles related to "pixel, pixels":

Label Tag - System Description
... The host sends print commands with the pixel information of the image to the drive ... takes care of the interpretation of the pixel information and location of the image on the disc ... The drive Servo part finally records the pixel information on the correct location including the encoded line numbering ...
Adobe Pixel Bender
... Adobe Pixel Bender, previously codenamed Hydra, is a programming language created by Adobe Systems for the description of image processing algorithms ... The syntax is based on GLSL, and a Pixel Bender program is analogous to an OpenGL fragment shader, and is intended to be a loosely typed version of C++ ... Adobe Systems' Adobe Pixel Bender Toolkit is the IDE for scripting with Pixel Bender ...
Screen Space Ambient Occlusion - Implementation
... The algorithm is implemented as a pixel shader, analyzing the scene depth buffer which is stored in a texture ... For every pixel on the screen, the pixel shader samples the depth values around the current pixel and tries to compute the amount of occlusion from each of the sampled points ... solutions, such a brute force method would require about 200 texture reads per pixel for good visual quality ...
Pixel - Display Resolution
... resolution of a display device (such as a digital television) is the number of distinct pixels in each dimension that can be displayed ...
Correlated Double Sampling
... sampling is a noise reduction technique in which the Reference Voltage of the pixel (i.e ... the pixel’s voltage after it is reset) is removed from the Signal Voltage of the pixel (i.e ... the pixel’s voltage at the end of integration) at the end of each integration period ...