Super Easy Short Computer Notes To Improve Computer Literacy and Your IT Skills

Sponsored Links

Wednesday, December 21, 2011

Create Your First Web Page in HTML

Leave a Comment
Today, we will discuss the topic Create Your First  Web Page in HTML. As we know a website is a set interlinked related web pages. Therefore, to design and develop a website, we need to know creating web pages. HTML stands for Hyper Text Markup Language. HTML is the basic language used to create web pages.
Let's start our tutorial with suitable pictures Create Your First  Web Page in HTML.
Now we will create a simple web page to display some text like "Welcome to Web Page Development!" and with a title "My First Web Page".


1. Type HTML Code in Note Pad

Open Note pad and type the following HTML code.
<HTML>
<HEAD>
<TITLE>My First Web Page</TITLE>      
</HEAD>
<BODY>
Welcome To Web Page Development!
</BODY>
</HTML>

Picture: Create Your First  Web Page in HTML in 5 minutes


Create Your First  Web Page in HTML Easily - Instructions with Pictures


How to Create Your First  Web Page in HTML


Picture: Create Your First  Web Page in HTML Easily

How to Create Your First  Web Page in HTML Easy Tutorial




2. Save HTML Document with HTML extension

Save this file as "FIRST.HTML". Click on File menu, click on Save, Type "FIRST.HTML" in file name box, select Desktop as a location to save, click on Save Button.

Create Your First  Web Page in HTML

Picture: Create Your First  Web Page in HTML Made Easy

Easy Tutorial Create Your First  Web Page in HTML

3. View Your Web Page in Web Browser

You will see that the file will be saved with a blue "e" Internet Explorer icon. Double click on the file and view the resulting web page in internet explorer window. You can see the pictures given to learn web page creation easily:

Create Your First  Web Page in HTML in 5 minutes


Picture: Create Your First  Web Page in HTML ( Final Product = The Output )

Made Easy Create Your First  Web Page in HTML in 5 minutes
Read More...

Basic Structure of HTML Document

Leave a Comment

Basic Structure of HTML Document 

The basic structure of an HTML document is given below:
<HTML>
        <HEAD>
         
       </HEAD>


        
       <BODY>

        
      </BODY>

</HTML>
The above format shows that an HTML document starts
with <HTML> tag and ends with </HTML> tag. It is also clear
that an HTML document consists of two main sections:


  1.  Head Section

Head section is used to specify a title of the web
page, normally. There are some other uses of Head section too, like linking
external style sheets and Java script code, etc. Head section starts with the <HEAD>
tag
and ends with the </HEAD> tag. <TITLE> tag is used to
display a title of the web page on title bar of the web browser.


basic structure of html web page document

  1. Body Section

Body section contains all the text and tags. It is used to specify the actual
content of the web page. Body section starts with <BODY> tag and
ends with </BODY> tag.
Read More...

How To Create a Web Page In HTML

1 comment
If you want to create a web page using HTML - Hyper Text Markup Language, you will need the following two software:
  1. Text Editor: It is used to write HTML tags according to the requirements of the web page. Windows Notepad is a suitable candidate for this purpose. You have to save the HTML document with html or htm extension. For example, type the name of your web page document as "first.html".



  1. Web Browser: Web Browser is a software used to view web pages. Examples of a web browser are Internet Explorer, Mozilla Firefox and Google Chrome. Microsoft Windows users can view and test their web pages, in Internet Explorer. 



I will discuss the Basic Structure of an HTML Document, in my next post.
Read More...

Introduction To HTML

1 comment
HTML stands for Hypertext Markup Language. Hypertext refers to the text with Links. These links may point to sections of the same web page or any other web page within or outside the website.

HTML Definition

HTML is a language used to create and format web pages. HTML is used to define the structure and format of a web page. HTML will place and format the contents like text, pictures, audio or video data in your web pages. Moreover,you can use Links to connect the related web pages in the form of a website.


 Who Invented HTML?

HTML was developed by Tim Berners Lee in 1989.

TAGS and Elements

HTML uses commands called TAGS to create and format different elements
and contents of a web page. HTML tags are enclosed within angle brackets <>. For example <b> tag is used to format some text as bold text.
Normally, tags work in pairs as shown in the example below.

<b> This is bold text. </b>
The output of the above HTML command or tag will be as show next in blue:
This is bold text.

The <b> tag is called Opening Tag or start tag, whereas </b>
tag is called Closing Tag or end tag. most of the tags use both opening
and closing tags. A few tags like <br> tag (used for line break)
and <hr> tag (used for horizontal rule, that is, a horizontal line)
is used as single tags. They do not need closing tags. Such tags are also called
Empty Tags.
Every HTML Tag is related to some HTML element. For example, <TABLE>
tag
is used to create a table HTML element. Each HTML documents consists of
HTML elements.

Attributes

An attribute is an additional information to implement a tag. It gives some
extra information to enhance the format of the element related to that tag. For
example, <TABLE> tag is used to create a table in a web page. If we use a
<TABLE> tag without a BORDER attribute, table element will have no
border. If we use BORDER="1" in opening <TABLE> tag,
table will be created with a border.  BORDER is the attribute to
specify border width for a table and 1 is the value assigned to BORDER
attribute, as shown below:


<TABLE BORDER="1">          
                                           
.

.

.

</TABLE>                                  

Note: Attribute is used in Opening Tag always like BORDER="1".
Note: No attribute in Closing Tag.
Read More...

Sunday, December 4, 2011

Advantages and Disadvantages of Mesh Topology

1 comment

Mesh Topology

In a mesh topology, every device on the network is physically connected to every other device on the network. Therefore, data can be sent on several possible paths from source computer to destination computer. Mesh topology is more reliable with better performance. It is mostly used in wide area networks where reliability is important.




Advantages of Mesh Network Topology

1. Since, there are many links to transfer data, Mesh topology gets rid of the traffic problem. Data may be transferred through different links.
2. If one link becomes unusable, it does not disturb the whole system. Other links can be used for communication.
3. Since each node has physical connection with other nodes, therefore, one node can transfer data to many nodes at the same time.

Disadvantages of Mesh Network Topology

1. It is very expensive due to implementation of multiple links for each node.
2. It is difficult to install and reconfigure.
3. Adding or removing a computer is difficult.

Read  More on Networking
and Networks
1 Explain
Advantages Of Networks
2 Types
Of Computer Networks
3 Differences
between LAN and WAN
4 Types
Of Network Topology
5 Bus
Topology :Advantages and Disadvantages
6 Advantages
and Disadvantages of Star Topology
7 Advantages
and Disadvantages of Ring Network Topology
8 Advantages
and Disadvantages of Tree Topology
9 Advantages
and Disadvantages of Mesh Topology
Read More...

Advantages and Disadvantages of Tree Topology

Leave a Comment

Tree Topology

Actually, a Tree topology is the combination of two topologies: bus topology  and star topology. A tree topology combines the characteristics of bus and star topologies. It consists of groups of computer connected as star topology. These groups are then connected to a central communication medium (bus cable).




Advantages of Tree Network Topology

1. Many software and hardware vendors support tree topology.
2. It provides point-to-point wiring for individual groups.

Disadvantages of Tree Network Topology

1. If the main backbone line breaks, the entire tree network goes down.
2. It is more difficult to configure and maintain.
3. If any hub fails, related segment will be removed from the network.

Read  More on Networking
and Networks
1 Explain
Advantages Of Networks
2 Types
Of Computer Networks
3 Differences
between LAN and WAN
4 Types
Of Network Topology
5 Bus
Topology :Advantages and Disadvantages
6 Advantages
and Disadvantages of Star Topology
7 Advantages
and Disadvantages of Ring Network Topology
8 Advantages
and Disadvantages of Tree Topology
9 Advantages
and Disadvantages of Mesh Topology
Read More...

Advantages and Disadvantages of Ring Network Topology

1 comment

Ring Topology

In Ring topology, each computer is connected to the next computer such that last computer is connected to the first. Every computer is connected to next computer in the ring. Each computer retransmits what it receives from the previous computer. Suppose, computer A needs to send data to computer D. Now the computer A sends data to computer B. As computer B is not the destination computer, so it will retransmit data to computer C. Finally, Computer C will transfer data to computer D, the destination computer. When a node sends a message, the message is processed by each computer in the ring. If a computer is not the destination node, it will pass the message to the next node, until the message arrives at its destination.



Advantages of Ring Network Topology

1. It is relatively less expensive than a star topology network.
2. In a Ring topology, every computer has an equal access to the network.
3. Performs better than a bus topology under heavy network load

Disadvantages of Ring Network Topology

1. Failure of one computer in the ring can affect the whole network.
2. It is difficult to find faults in a ring network topology.
3. Adding or removing computers will also affect the whole network since every computer is connected with previous and next computer.
4. Sending a message from one computer to another takes time according to the number of nodes between the two computers. Communication delay is directly proportional to number of nodes in the network.

Read  More on Networking
and Networks

1 Explain
Advantages Of Networks
2 Types
Of Computer Networks
3 Differences
between LAN and WAN
4 Types
Of Network Topology
5 Bus
Topology :Advantages and Disadvantages
6 Advantages
and Disadvantages of Star Topology
7 Advantages
and Disadvantages of Ring Network Topology
8 Advantages
and Disadvantages of Tree Topology
9 Advantages
and Disadvantages of Mesh Topology
Read More...

Advantages and Disadvantages of Star Topology

2 comments

Star Topology

Star Topology is the most popular and widely used network topology in local area networks. In star topology, all computers are connected with a central device known as HUB or Switch. Now-a-days Hubs are often replaced by Fast Network Switches. The sender computer sends data to the hub. The hub sends it to the destination computer. So, all data communication is managed through HUB or Switch.
Note: The major difference between a Networking Hub and Networking Switch is that HUB sends data to all computers, and the destination computer will accept it while other computers will not. On the other hand, Switch sends data only to the destination computer. Therefore, switch can reduce network traffic and hence provides fast transmission speed.




Advantages of Star Network Topology

1. Easy Installation and maintenance

It is easy to maintain network. That is why it is so popular.

2. Adding or removing computers

Adding or removing computers can be done without disturbing the network. We connect the new computer with the HUB by means of a networking cable. One end of the cable (RJ 45 connector) is inserted in computer’s Network Interface Card and the other end (RJ 45 connector) is plugged into the HUB, and that’s it.

3. Fault Diagnosis

In a star network topology, finding faults is easy. If a computer is no more connected with your network, you can check its cable and connectors or network settings in its Operating system.

4. Network Reliability

Single computer failure will not disturb whole network, since all other computers are connected with separate links ( wires ) to HUB. Definitely, they will work fine.

5. Better performance

Star topology can prevents the passing of data through an excessive number of nodes. By using a Switch, at most, 3 devices and 2 links are involved in any communication between any two devices.
6. Device Isolation
Each device is separately connected to HUB or Switch and is isolated. This is why each device works independently.

Disadvantages of Star Network Topology

1. In star network topology, data communication depends on HUB. If central hub fails, then whole network fails.
2. Since each computer will be connected with HUB by means of a separate wire, star network topology needs more cable to connect computers.
3. It is more expensive due to more wires.

Read  More on Networking
and Networks

1 Explain
Advantages Of Networks
2 Types
Of Computer Networks
3 Differences
between LAN and WAN
4 Types
Of Network Topology
5 Bus
Topology :Advantages and Disadvantages
6 Advantages
and Disadvantages of Star Topology
7 Advantages
and Disadvantages of Ring Network Topology
8 Advantages
and Disadvantages of Tree Topology
9 Advantages
and Disadvantages of Mesh Topology
Read More...

Bus Topology Advantages Disadvantages

Leave a Comment

Bus Topology

Bus topology is the simplest network topology. In bus topology, all computers in network are connected to a common communication wire. This wire is called BUS. Terminators are used at both ends of wire.





Advantages of Bus Network Topology


1. It is very simple topology.
2. It is easy to use.
3. It needs small amount of wire for connecting computers.
4. It is less expensive due to small wire needed.
5. If one computer fails, it does not disturb the other computers in network. Other computers will continue to share information and other resources with other connected computers.

Disadvantages of Bus Network Topology


1. Only small number of computers can be connected in a bus network.
2. Network speed slows down as the number of computer increases in bus topology.
3. Finding a fault is difficult in bus topology.

Read  More on Networking
and Networks
1 Explain
Advantages Of Networks
2 Types
Of Computer Networks
3 Differences
between LAN and WAN
4 Types
Of Network Topology
5 Bus
Topology :Advantages and Disadvantages
6 Advantages
and Disadvantages of Star Topology
7 Advantages
and Disadvantages of Ring Network Topology
8 Advantages
and Disadvantages of Tree Topology
9 Advantages
and Disadvantages of Mesh Topology
Read More...

Types Of Network Topology

3 comments
Today, we will types of network topology.

What is a Network Topology?

Network topology is the shape of the network. It is the physical layout of connected devices in a network. It tells us how a network will look like. The characteristics of a network depend upon the network topology selected.

Explain different types of network topologies

Different network topologies are as follows:
1. Bus Topology
2. Ring Topology
3. Star Topology
4. Tree Topology
5. Mesh Topology

1. Bus Topology


types of network topology


Bus topology is the simplest network topology. In bus topology, all computers in network are connected to a common communication wire. This wire is called BUS. Terminators are used at both ends of wire.

2. Star Topology

Star Topology is the most popular and widely used network topology in local area networks. In star topology, all computers are connected with a central device known as HUB or Switch. Now-a-days Hubs are often replaced by Fast Network Switches. The sender computer sends data to the hub. The hub sends it to the destination computer. So, all data communication is managed through HUB or Switch.
Note: The major difference between a Networking Hub and Networking Switch is that HUB sends data to all computers, and the destination computer will accept it while other computers will not. On the other hand, Switch sends data only to the destination computer. Therefore, switch can reduce network traffic and hence provides fast transmission speed.

3. Ring Topology

In Ring topology, each computer is connected to the next computer such that last computer is connected to the first. Every computer is connected to next computer in the ring. Each computer retransmits what it receives from the previous computer. Suppose, computer A needs to send data to computer D. Now the computer A sends data to computer B. As computer B is not the destination computer, so it will retransmit data to computer C. Finally, Computer C will transfer data to computer D, the destination computer. When a node sends a message, the message is processed by each computer in the ring. If a computer is not the destination node, it will pass the message to the next node, until the message arrives at its destination.

4. Tree Topology

Actually, a Tree topology is the combination of two topologies: bus and star topology. A tree topology combines the characteristics of bus and star topologies. It consists of groups of computer connected as star topology. These groups are then connected to a central communication medium (bus cable).

5. Mesh Topology

In a mesh topology, every device on the network is physically connected to every other device on the network. Therefore, data can be sent on several possible paths from source computer to destination computer. Mesh topology is more reliable with better performance. It is mostly used in wide area networks where reliability is important.

After reading : Types of network topology


Read  More on Networking
and Networks
1 Explain
Advantages Of Networks
2 Types
Of Computer Networks
3 Differences
between LAN and WAN
4 Types
Of Network Topology
5 Bus
Topology :Advantages and Disadvantages
6 Advantages
and Disadvantages of Star Topology
7 Advantages
and Disadvantages of Ring Network Topology
8 Advantages
and Disadvantages of Tree Topology
9 Advantages
and Disadvantages of Mesh Topology
Read More...

Saturday, November 26, 2011

Differences between LAN and WAN

Leave a Comment



The differences between LAN and WAN is as follows:
LAN (Local Area Network)

1.

LAN is used to connect computers at one place, in one room or a building.
2.

LAN covers small and limited area.

3.

Data transfer speed is very fast in LAN because of small distance.

4.
Local Area network speed is normally form 1 to l00 Mbps.
5.

LAN is less costly.

6.

LAN is usually connected through wires.

7.

Normally, the   connection    in    a    LAN    is permanent using wires.

8.

LAN is used for sharing data, information, files and hardware like printers, hard disk, modem etc.

9.

LAN has   less   possibility   of data transmission error.

10.
LAN is used to transfer data over small distances.
11
LAN is easy to install and configure.
12
LAN is easy to troubleshoot.
WAN (Wide Area Network)
1
WAN is used to connect computers anywhere in the world.
2
WAN can cover larger area. It can cover cities, countries and even continents.

3
Data transfer speed is slower in WAN.

4
Transmission     speeds     are     normally 56 kbps to 45 Mbps.
5
The hardware needed for a WAN is more expensive.

6
WAN is usually connected through telephone lines, fiber optic cable or through wireless media.

7
The    connection    in    WAN    may not be permanent.

8
WAN is used to share only data and information like Email and file transfer

9
WAN has more possibility of data transmission error because of long distance.

10
WAN is used to transfer data over long distances.
11
WAN is difficult to install and configure due to connecting computers at multiple and distant sites.
12
WANs are difficult to troubleshoot.
Read More...

Friday, November 25, 2011

Types Of Computer Networks

Leave a Comment

Explain different types of computer networks:(LAN,WAN,MAN)

Today, we will discuss the main types of computer networks on the basis of the distance over which they operate. The main types of computer networks are:

1.    LAN - Local-Area Network
2.    WAN - Wide-Area Network
3.    MAN - Metropolitan-Area Network

1)LAN (Local Area Network)

What is LAN or Local Area Network

LAN stands for Local Area Network. It covers a small area. Most LANs are used to connect computers in a single building or group of near buildings. Hundreds or thousands of computers may be connected through LAN. LANs are used in office buildings, college or university campus etc. Local Area Networks can transfer data at a very high speed. Data transmission speeds of LAN are 1 to 100 megabits per second.

Examples of Local Area Network

Following are examples of LAN:
  • LAN is used in a computer lab to connect computers. The students can share software, files and data in the lab.
  • In Internet cafe, many computers can be connected through LAN. These computers can share single connection of Internet.
  • Local Area Network can be used in an office to share common data and a network printer and any other software or hardware.
  • A local area network in a digital library can provide access to centralized collection of digital books for many readers using different computers in library building.
2)WAN (Wide Area Network)

What is WAN or Wide Area Network?

WAN stands for wide area network. It covers a large area. WAN connects computers in different cities, countries and continents. So, Wide Area Networks are used to transfer data over very long distances across cities, countries or even in whole world. WANs are used to connect LANs and other types of networks together, so that users and computers in one location can communicate with users and computers in other locations.
Computers in WAN are often connected through leased lines telephone lines. They can also be connected through satellites. Transmission rate of WAN is 56 kbps to 45 Mbps. WAN is expensive than LAN. WAN is not as fast as LAN. There is a possibility of error in data transmission due to very long distance they cover. The largest WAN  is the Internet. With the help of internet, we can send our data in any part of the world.

Examples of WAN

  • In air line ticketing system, many offices of an air line company can be joined together using WAN. A person can get a ticket from any office in the country.
  • A bank with many branches in different cities can connect its branches through WAN. The customer can use his account from any branch.
3)MAN (Metropolitan-Area Network)


What is MAN or Metropolitan Area Network? 

A metropolitan area network (MAN) is a network that covers an area of the size of a city. So, a MAN is larger than a local area network but it is smaller than a WAN. A MAN is optimized for a larger geographical area than a LAN, ranging from several blocks of buildings to entire cities. MANs can use communications channels of moderate-to-high data transfer rates. It may use fiber Optic cable for fast speeds.
A MAN typically includes one or more LANs but cover a small area than WAN. A MAN often acts as a high-speed network.

Examples of MAN or Metropolitan Area Network:

  • Mobile phones systems often use MAN.
  • Many local ISPs manage MAN with the help of cable modems within a city.
  • Local cable TV networks also uses MAN technologies.

Read  More on Networking
and Networks
1 Explain
Advantages Of Networks
2 Types
Of Computer Networks
3 Differences
between LAN and WAN
4 Types
Of Network Topology
5 Bus
Topology :Advantages and Disadvantages
6 Advantages
and Disadvantages of Star Topology
7 Advantages
and Disadvantages of Ring Network Topology
8 Advantages
and Disadvantages of Tree Topology
9 Advantages
and Disadvantages of Mesh Topology
Read More...

Wednesday, November 23, 2011

Explain Advantages Of Networks

Leave a Comment

Define Network with examples. Give importance of Computer Network.

COMPUTER NETWORK

We can define a Computer Network as a set of two or more connected computers to share information and other resources (data, files, printers, hard disk, modem, CD-Rom Drive, CD-Writer, DVD-Rom Drive, DVD-Writer etc.). The computers in a network can share:
Data, Information, Files
Software
Hardware (printers, disk, modems)etc.

EXAMPLES OF COMPUTER NETWORK

  • Computer network can be used in an office. Different people in the office can share common information and printer.
  • Net Cafes use Computer Network for internet sharing. Net Cafe Owners can save money by sharing one DSL Routers / Modem and a single Internet Connection.
  • Computer Network is used in Computer Laboratories of Schools, Colleges and other educational institutes.
  • Internet, is also an example of a computer network. Internet is a network of millions of computers connected through phone lines. People can share information, files and talk with one another through internet.




    ADVANTAGES OF COMPUTER NETWORKS

    Following are some important advantages of computer networks:

    1. Data and Information Sharing

    Different employees of an organization can share common information with the help of computer network.

    2. Software Sharing

    Different software can be shared with the help of computer networks.

    3. Hardware Sharing

    Different hardware can be shared with the help of computer networks. For example, if there are five computer users in an office, we can save cost by using only one printer with the help of computer networking. In a computer network, only one computer will manage all printing needs of the computer users in a small office. In addition, we can share other hard ware devices like hard disks, CD-Rom Drives / Writers, modems, routers and scanners etc.

    4. Money Saving

    We can save a lot of money by using computer networking, because of sharing the same software and hardware in a network.

    5. Internet Sharing

    We can buy only one DSL internet connection and share it with in whole organization with the help of computer networking.

    6. Easy Communication Within Organization

    We can send and receive messages and files through network. In this way, a file can be moved to one place to another within an organization without the need of a physical worker to take and carry the files to a destination. With the help of a command in a computer we can transfer file within seconds from one room to another.

    7. Easy Communication Outside Organization

    We can send and receive emails and share files with other people outside organization using internet.

    Read  More on Networking
    and Networks

    1 Explain
    Advantages Of Networks
    2 Types
    Of Computer Networks
    3 Differences
    between LAN and WAN
    4 Types
    Of Network Topology
    5 Bus
    Topology :Advantages and Disadvantages
    6 Advantages
    and Disadvantages of Star Topology
    7 Advantages
    and Disadvantages of Ring Network Topology
    8 Advantages
    and Disadvantages of Tree Topology
    9 Advantages
    and Disadvantages of Mesh Topology
    Read More...

    Monday, November 21, 2011

    Types Of Scanners Input Device

    1 comment

    Scanner / Optical Scanner

    A scanner is an input device for computer. It can scan any printed document with text as well as images. It will :
    • Read any printed paper or picture,
    • Convert text or images into digital form
    • Saves this converted digital file into computer storage for later use

    Uses Of Optical Scanners

    You can scan your documents or pictures to:
    1. Store into computer memory.
    2. To save lot of effort and time because if you type the whole text on printed page, it will take effort as well as time).
    3. Show image or text on computer screen or on a multimedia projector's screen.
    4. In addition, you can send this scanned document or image to your friends all over the world with the help of Internet & Email.
    5. You can publish the scanned documents or images on your website or blog.
    6. You can apply online and send the scanned images of your academic documents in any part of the world within minutes.
    7. If your scanner supports OCR - Optical Character Recognition, you can scan a page with printed text and save it in an editable computer file. You can change or add more contents in this scanned file.

    Types Of Optical Scanners

    There are different types of scanners:

    1. Flat Bed Scanner




    A flatbed scanner is the most common type of optical scanners used to scan printed text and images and save into computer storage as a digital file. It works on the principle of a photo copier machine. We pickup the cover of the scanner and place the printed page on the glass surface of the scanner. Now we will instruct scanner through computer software to start scanning. The scanner will scan with the help of light and save the digital file into computer storage. If you have an OCR scanner, you can save your text into editable form. This will save a lot of hard work and time to enter text by keyboard too. It is widely used in offices, schools, colleges, universities and homes for common scanning needs. If a book is very rare or difficult to find, we can scan its all pages one by one. Later on we can take prints of these scanned pages through a color printer.

    2. Sheet Fed Scanner




    A sheet fed scanner works like a fax machine mechanism. In a sheet fed scanner, pages are entered into scanner like a fax machine.

    Advantages of Sheet Fed Scanner

    1. A feet shed scanner is relatively smaller in size.
    2. It is more portable.
    3. It takes less space.

    Disadvantages Of Sheet Fed Scanner

    1. It requires separate pages to scan. But, it cannot scan a book because of its binding. 
    2. It can scan normal papers with normal thickness only. 

    3. Hand Held Scanner




    Hand Held scanner is a small, light weight scanner and portable scanner. It is used to scan small amount of data like short articles from news papers. It is held in hand and is moved over the text page or image slowly and smoothly from start to end. Its scan quality may be lower than flat bed or sheet fed scanner but it can used to capture small amounts of text or small images, quickly.

    SkyPix Hand held Scanner




    This is a portable, cordless hand held scanner that is used to scan and save important documents, letters, or pictures. It records scanned documents in its memory card. you can transfer these scanned documents on yor computer for later use. You can scan and save important news from the news papers or interesting articles from magazines.

    4. Drum Scanners




    Drum scanners are used by the Publishers to scan images with details. Drum scanners use photomultiplier tube technology. In drum scanners, the document to be scanned is mounted on a glass cylinder. At the center of the cylinder is a sensor that splits light bounced from the document into three beams. Each beam is sent through a color filter into a photomultiplier tube where the light is changed into an electrical signal. And in this way a complete image with immense details can be obtained. Drum scanners are widely used in publishing industry.
    Read More...

    Recent Posts

    Sponsored Links
    .