Multimedia

Multimedia is a method used more than one type of media simultaneously.
In fact it is a computer-based method of presenting information by using two or more mediums of communication, such as text, graphics and sound etc. 

Multimedia Components: -

Following are the components of multimedia: 

•   Textual Information 

•   Images

•    Animation  

•    Digital Audio

 •    Digital Video

Printers:-

 Printer is a device that produces written images (numbers, alphabets, graphs
etc) on the paper. After a document been created on a computer, we can send it to a printer for a hard copy, generally known as a printout. Broadly, printer can be classified into two categories. 

• Impact Printers

 •  Non-Impact Printers

Printers:-

 A printer, which creates the image or prints characters by using pins or
hammer to press an inked ribbon against the paper. The most common types of impact printer are - Line Printer, and Dot Matrix Printer etc. 

Dot Matrix Printers: -

Dot Matrix Printer contains a print head containing a matrix of short pins,
which are arranged in one or more columns. On receiving signal from PC appropriate combination of pins strike on the ribbon to form the character on thepaper. The ribbon is placed between the paper and print head, they press ink on to a piece of paper.
           The printing quality depends upon the resolution of the printer's head. The high-resolution printer's head contains 24-pins and low-resolution printer's head contains 9-pins only. The speed of dot matrix printer is measured in character per second (cps) and it lies between 50 cps to 500 cps.

 Line Printers: -

Line printers are just like the dot matrix printers, which contains special print head. They print entire line at one time in place of forming character. Line printers do not offer high resolutions but they are very fast. The speed of line printer is measured in lines per minute (lpm). The fast printers can print 3000 lines per minute. 

Non-Impact Printer: -

A printer, which performs some type of operation to the paper instead on the physically striking it. To print characters with such printers, different technologies are being used. Inkjet printers use tiny nozzles to spray droplets of ink onto the page. Laser printers work like photocopier, using heat to bond microscopic particles of dry toner to specific parts of the page.

Inkjet Printers:-

 Inkjet Printer creates an image directly on the Paper by spraying ink throug
tiny nozzles. The printing qualities of inkjet printers are incredible better than dot matrix and line printers. The printing quality depends upon the resolution of printer which is measured in dots per inch (dpi) and speed of inkjet printers are measured in page per minute (PPM).

Laser Printers: -

Laser printers utilize laser beam to produce an image on a drum. The light of

the laser alters the electrical charge on the drum wherever it hits. The drum is then rolled through a reservoir of toner, which is picked up by the charged portions of the drum. Finally, the toner is transferred to the paper through a combination of heat and pressure. Because an entire page is transmitted to a drum before the toner is applied, laser printers are sometimes called page printers. The resolutions of laser printers lie between 300 dpi to 2400 dpi. The spee
of laser printers ranges from 4 to 20 pages of text per minute (ppm). 

Scanner:-

                   Optical scanning devices are used to speed the process and to reduce the risk of input errors. Scanners convert any printed image into electronic form by shining light onto the image and sensing the intensity of the light's reflection at every point. The scanner is useful, because it translates printed images into an electronic format that can be stored in a computer's memory. Then you can use software to organize or manipulate the electronic image. For example, if you scan a photo, you can use a graphics program, such as Adobe PhotoShop, to increase the contrast or adjust the colors. The software used in scanner translates the array of dots into text that the computer can interpret as letters and numbers. The scanner is installed on USB port and resolution speed is 2400 optical dpi (dot per inch).