16. What are the features of Inkjet printers?
17. What are the advantages of laser printer
• High speed, precision and economy.
• Cheap to maintain.
• Quality printers.
• Lasts for longer time.
• Toner power is very cheap.
18. What are the advantages of electrostatic plotters?
• They are faster than pen plotters and very high quality printers.
• Recent electrostatic plotters include a scan-conversion capability.
• Color electrostatic plotters are available. They make multiple passes over the paper to plot color pictures.
19. Define pixel?
Pixel is shortened forms of picture element. Each screen point is referred to as pixel or pel.
20. What is frame buffer?
Picture definition is stored in a memory area called frame buffer or refresh buffer.
21. What is bitmap and what is pixmap?
The frame buffer used in the black and white system is known as bitmap which take one bit per pixel. For systems with multiple bits per pixel, the frame buffer is often referred to as a pixmap.
22. What is a Vector display or stroke writing or calligraphic display?
Random scan monitors draw a picture one line at a time and for this reason are also referred as vector displays.
23. Where the video controller is used?
A special purpose processor, which is used to control the operation of the display device, is known as video controller or display controller.
24. What do you mean by scan conversion?
A major task of the display processor is digitizing a picture definition given in an application program into a set of pixel-intensity values for storage in the frame buffer. This digitization process is called scan conversion.
25. What is run length encoding?
Run length encoding is a compression technique used to store the intensity values in the frame buffer, which stores each scan line as a set of integer pairs. One number each pair indicates an intensity value, and second number specifies the number of adjacent pixels on the scan line that are to have that intensity value
- They can print 2 to 4 pages/minutes.
- Resolution is about 360d.p.i. Therefore better print quality is achieved.
- The operating cost is very low.
- The only part that requires replacement is ink cartridge.
- 4 colors cyane, yellow, majenta, black are available.
17. What are the advantages of laser printer
• High speed, precision and economy.
• Cheap to maintain.
• Quality printers.
• Lasts for longer time.
• Toner power is very cheap.
18. What are the advantages of electrostatic plotters?
• They are faster than pen plotters and very high quality printers.
• Recent electrostatic plotters include a scan-conversion capability.
• Color electrostatic plotters are available. They make multiple passes over the paper to plot color pictures.
19. Define pixel?
Pixel is shortened forms of picture element. Each screen point is referred to as pixel or pel.
20. What is frame buffer?
Picture definition is stored in a memory area called frame buffer or refresh buffer.
21. What is bitmap and what is pixmap?
The frame buffer used in the black and white system is known as bitmap which take one bit per pixel. For systems with multiple bits per pixel, the frame buffer is often referred to as a pixmap.
22. What is a Vector display or stroke writing or calligraphic display?
Random scan monitors draw a picture one line at a time and for this reason are also referred as vector displays.
23. Where the video controller is used?
A special purpose processor, which is used to control the operation of the display device, is known as video controller or display controller.
24. What do you mean by scan conversion?
A major task of the display processor is digitizing a picture definition given in an application program into a set of pixel-intensity values for storage in the frame buffer. This digitization process is called scan conversion.
25. What is run length encoding?
Run length encoding is a compression technique used to store the intensity values in the frame buffer, which stores each scan line as a set of integer pairs. One number each pair indicates an intensity value, and second number specifies the number of adjacent pixels on the scan line that are to have that intensity value
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