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line

One speaks of a line in text and video representations. In the first case it is a horizontal arrangement of letters, numbers and characters

, in the second case it is a horizontal arrangement of pixels. In screen and video technology, a line is a horizontal line that extends from the left to the right edge of the screen and contains brightness and color information. In analog display, the brightness and color information correspond to different levels; in digital display, each pixel has digital values for red, green, and blue. Many lines lying one below the other form an image. In computer displays, the line length depends on the image format

, thescreen resolution and the aspect ratio. In television technology and video technology, it depends on the video standard and television standard

.In computer displays, the lines are represented digitally

in individual pixels.

The number of pixels, taking into account the pixel clock, is a measure of the line length, although it should be noted that pixels are not always square. If you look at the common screen resolutions, they range from 320 pixels for Quarter VGA (QVGA) to 3,840 for WQUXGA. The specifications always refer to the pixels displayed.

Digital TV standard 1,080 with number of pixels and lines.

Digital TV standard 1,080 with number of pixels and lines

The situation is different for digital TV and digital video. Here, a distinction is made between the total number of pixels and the active number of pixels in a line. The difference between the two values lies in the length of the blanking, which varies depending on the television standard and display format. For example, Standard Definition Television (SDTV) works with 480 (USA) or 576 and HDTV with 1,080 lines. Since the display formats are 4:3 or 16:9, lines can consist of 720, 1,280 or 1,920 pixels.

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Englisch: line
Updated at: 03.12.2012
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