Scan line

In today's world, Scan line has become a topic of great relevance and interest to a wide spectrum of people. Both professionally and personally, Scan line has generated debates and discussions about its impact and influence on society. From its origin to its current evolution, Scan line has been the subject of studies and research that have tried to shed light on its implications and consequences. In this article, we will explore some fundamental aspects of Scan line and analyze its role in different contexts. From its connection with technology, through its relationship with culture and politics, to its importance in everyday life, Scan line is a topic that continues to generate interest and reflection today.

Scanlines on a Mitsubishi CS-40307 CRT color television. The fine dots through the bright scanlines are due to the shadow mask.
PAL video signal scan line. From the left: horizontal sync pulse, back porch with color burst, signal itself, front porch, sync pulse, back porch with color burst, video portion of the next scan line. The signals from multiple lines are overlaid, showing shaded areas instead of a single curve.

A scan line (also scanline) is one line, or row, in a raster scanning pattern, such as a line of video on a cathode-ray tube (CRT) display of a television set or computer monitor.[1]

On CRT screens the horizontal scan lines are visually discernible, even when viewed from a distance, as alternating colored lines and black lines, especially when a progressive scan signal with below maximum vertical resolution is displayed.[2] This is sometimes used today as a visual effect in computer graphics.[3]

The term is used, by analogy, for a single row of pixels in a raster graphics image.[4] 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 a byte or word; see for example BMP file format). This means that even otherwise compatible raster data may need to be analyzed at the level of scan lines in order to convert between formats.

See also

References

  1. ^ Keith Jack and Vladimir Tsatsulin (2002). Dictionary of Video and Television Technology. Newnes. p. 242. ISBN 978-1-878707-99-4.
  2. ^ Wesley Fenlon (15 January 2014). "In Search of Scanlines: The Best CRT Monitor for Retro Gaming". Tested.
  3. ^ Gabriel B. (December 2012). "Freeware Friday: Maldita Castilla". Blistered Thumbs. Archived from the original on 2014-02-27.
  4. ^ Robin Stuart Ferguson (2001). Practical algorithms for 3D computer graphics. A K Peters, Ltd. p. 104. ISBN 978-1-56881-154-3.


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