Information about Scan Line
A scan line is one line, or row, in a raster scanning pattern, such as a video line on a cathode ray tube (CRT) display of a television or computer. A scan line represents a row of picture elements (pixels) in the image being displayed.
The term is used, by analogy, for the representation of a single row of bitmap data in raster graphics. 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.
On older CRT screens, the horizontal scan lines were visually discernible even when viewing from a distance, as alternating colored lines and black lines. This is sometimes used today as a visual effect in computer graphics.
See also
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.
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In video, lines are a measurement of display resolution or image resolution. While the EIA standard for RS-170 video is 525 horizontal lines, this is not the same lines. The NTSC standard for RS-170 has a resolution of 480 TV Lines.
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1. Electron guns 2. Electron beams 3. Focusing coils 4. Deflection coils 5. Anode connection 6. Mask for separating beams for red, green, and blue part of displayed image 7.
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pixel (short for picture element, using the common abbreviation "pix" for "pictures") is a single point in a graphic image. Each such information element is not really a dot, nor a square, but an abstract sample.
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bitmap or pixmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning just a map of bits, a spatially mapped array of bits.
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raster graphics image, digital image, or bitmap, is a data structure representing a generally rectangular grid of pixels, or points of color, viewable via a computer monitor, paper, or other display medium.
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This is a comparison of image file formats.
Format Full name Owner File extension MIME type Application Patented
ADRG ARC Digitized Raster Graphics .adrg
ADRI ARC Digitized Raster Images .
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General
Ownership of the format and related information.Format Full name Owner File extension MIME type Application Patented
ADRG ARC Digitized Raster Graphics .adrg
ADRI ARC Digitized Raster Images .
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Windows Bitmap
File extension:
MIME type:
Type code: 'BMP '
Uniform Type Identifier: com.microsoft.
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File extension:
.bmp or .dibMIME type:
image/x-ms-bmp (unofficial)Type code: 'BMP '
Uniform Type Identifier: com.microsoft.
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Visual effects (or 'VFX' for short) is the term given to a sub-category of special effects in which images or film frames are created and manipulated for film and video. Visual effects usually involve the integration of live-action footage with computer generated imagery or other
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Computer graphics is a sub-field of computer science and is concerned with digitally synthesizing and manipulating visual content. Although the term often refers to three-dimensional computer graphics, it also encompasses two-dimensional graphics and image processing.
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Fax (short for facsimile, from Latin fac simile, "make similar", i.e. "make a copy") is a telecommunications technology used to transfer copies (facsimiles) of documents, especially using affordable devices operating over the telephone network.
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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.
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pixel (short for picture element, using the common abbreviation "pix" for "pictures") is a single point in a graphic image. Each such information element is not really a dot, nor a square, but an abstract sample.
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Scanline rendering is an algorithm for 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.
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native resolution of a LCD, LCoS or other flat panel display refers to its single fixed resolution. As an LCD display consists of a fixed raster, it cannot change resolution to match the signal being displayed as a CRT monitor can, meaning that optimal display quality can be
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