What is Raster Graphics? – Basic Definition
Raster technology, found in cathode ray tubes (CRTs) and liquid crystal display (LCD) monitors, enables the creation of images for display. Essentially, a raster functions by generating horizontal lines across the viewing area. An electron beam scans these lines in a dual pattern, moving left to right and up and down, to create a complete image.
Advancements in Raster Technology
The scanning activity of the raster allows for the display of moving images. Technological advancements have improved scanning efficiency while maintaining the basic creation of horizontal line sequences. This enhancement has led to clearer image displays, particularly as desktop computers have become more prevalent in homes. Additionally, the improved raster resolution has facilitated the development of devices such as laptops and handheld displays.
Variations in Raster Technology
While the fundamental function of a raster remains consistent across different CRT and LCD devices, variations exist in the process used by each. For example, televisions employing CRT technology often utilize an interlaced raster pattern, resulting in slightly less sharp image displays compared to non-interlaced raster scanning used in computer monitors.
Factors Affecting Raster Resolution
The resolution of the raster can be influenced by external factors, such as the quality of the signal received for display. Television sets with high-resolution equipment may not perform optimally with broadcast signals received via antenna. Secure transmissions, like those delivered via cable or satellite, provide stronger signals, resulting in clearer displays compared to signals received via antennas.
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What is Pixels in Digital Imaging?
