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A scan line is one line, or row, in a raster scan
Raster scan

A Raster scan, or raster scanning, is the pattern of image detection and reconstruction in television, and is the pattern of image storage and transmission used in most computer bitmap image systems....
ning pattern, such as a video line
Line (video)

In video, lines are a measurement of display resolution or ....
 on a cathode ray tube
Cathode ray tube

The cathode ray tube is a vacuum tube containing an electron gun and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen....
 (CRT) display of a television or computer.

On older CRT screens the horizontal scan lines were visually discernible, even when viewed from a distance, as alternating colored lines and black lines. This is sometimes used today as a visual effect
Visual effects

Visual effects are the various processes by which imagery is created and/or manipulated outside the context of a live action shoot. Visual effects often involve the integration of live-action footage and computer generated imagery in order to create environments which look realistic, but would be dangerous, costly, or simply impossible to...
 in computer graphics
Computer graphics

Computer graphics are graphics created by computers and, more generally, the representation and manipulation of pictorial data by a computer....
.

The term is used, by analogy, for a single row of pixel
Pixel

In digital imaging, a pixel is the smallest item of information in an image. Pixels are normally arranged in a 2-dimensional grid, and are often represented using dots, squares, or rectangles....
s in a raster graphics
Raster graphics

In computer graphics, a raster graphics image or bitmap, is a data structure representing a generally Rectangle grid of pixels, or points of color, viewable via a Computer display, paper, or other display medium....
 image.






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A scan line is one line, or row, in a raster scan
Raster scan

A Raster scan, or raster scanning, is the pattern of image detection and reconstruction in television, and is the pattern of image storage and transmission used in most computer bitmap image systems....
ning pattern, such as a video line
Line (video)

In video, lines are a measurement of display resolution or ....
 on a cathode ray tube
Cathode ray tube

The cathode ray tube is a vacuum tube containing an electron gun and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen....
 (CRT) display of a television or computer.

On older CRT screens the horizontal scan lines were visually discernible, even when viewed from a distance, as alternating colored lines and black lines. This is sometimes used today as a visual effect
Visual effects

Visual effects are the various processes by which imagery is created and/or manipulated outside the context of a live action shoot. Visual effects often involve the integration of live-action footage and computer generated imagery in order to create environments which look realistic, but would be dangerous, costly, or simply impossible to...
 in computer graphics
Computer graphics

Computer graphics are graphics created by computers and, more generally, the representation and manipulation of pictorial data by a computer....
.

The term is used, by analogy, for a single row of pixel
Pixel

In digital imaging, a pixel is the smallest item of information in an image. Pixels are normally arranged in a 2-dimensional grid, and are often represented using dots, squares, or rectangles....
s in a raster graphics
Raster graphics

In computer graphics, a raster graphics image or bitmap, is a data structure representing a generally Rectangle grid of pixels, or points of color, viewable via a Computer display, paper, or other display medium....
 image. Scan lines are important in representations of image data, because many image file formats have special rules for data at the end of a scan line. For example, there may be a rule that each scan line starts on a particular boundary (such as byte or word; see for example BMP file format). This means that even otherwise compatible raster data may need to be analysed at the level of scan lines in order to convert between formats.

See also


  • Fax
    Fax

    Fax is a telecommunications technology used to transfer copies of documents, especially using affordable devices operating over the telephone network....
  • Raster scan
    Raster scan

    A Raster scan, or raster scanning, is the pattern of image detection and reconstruction in television, and is the pattern of image storage and transmission used in most computer bitmap image systems....
  • Pixel
    Pixel

    In digital imaging, a pixel is the smallest item of information in an image. Pixels are normally arranged in a 2-dimensional grid, and are often represented using dots, squares, or rectangles....
  • Scanline rendering
    Scanline rendering

    Scanline rendering is an algorithm for Hidden surface determination#Visible surface determination, in 3D computer graphics,that works on a row-by-row basis rather than a polygon-by-polygon or pixel-by-pixel basis....
  • Scanline fill
  • Native resolution
    Native resolution

    The native resolution of a liquid crystal display, LCoS or other flat panel display computer display refers to its single fixed Display resolution....