Nowadays, computers are widely used in the storage and processing of images in various formats . Falling prices of digital cameras and scanners all over the image is stored in digital form on a computer. Computers have become an indispensable tool for processing and retouching photos . The Web is unthinkable without the image content, occupies an important place in the presentation and advertising companies and institutions . The images that are presented on the Web must be processed and stored in a format suitable for display and transmission over the Internet . Photoshop CS2 software is intended for raster editing digital images . There are versions of the world ‘s leading application for image processing. Web designers can rely on the complete connection of Photoshop and ImageReady applications when creating web graphics with excellent ex- port for websites and tools for cutting larger image . Create a complete homepage in the table with rollover and animated gifs . Photoshop brings , of course, an enormous amount of tools for image processing for on-screen or paper use. Adobe Photoshop software is intended for raster editing digital images. Currently the leading graphical tool and is designed for use on Microsoft Windows and Apple operating systems. The company responsible for Photoshop called Adobe Systems. The first version of the professional tool was released in February 1990 and only on the Mac OS platform. Windows users are only with the version of Photoshop 2.5, which was released in November 1992, received access to this program. The word is used to revise the photos for suitable purposes (internet, e-mail, a joke). Photoshop is konstuiran in such a manner that it can freely collaborate with other programs Adobe company, for example. Adobe InDesign. Do you have an image that you want to use for the web, album or simply print it but it seems that when you enter into your computer (using a scanner, digital camera, camcorder, etc.) Has deteriorated? In the next few steps will be explained how to use Adobe Photoshop. Photoshop is one of the better treatment programs, creation and optimization of raster images. To become more familiar with its capabilities should understand some basic concepts. Raster program means that it is a program that presents the image using the dots or pixels. It is a size that is not directly associated with printing. What is important to us is that we know the difference between the pixels and DPI.
The informatics beginners is almost impossible to explain what it is virus free. Computer viruses are called viruses because someone once seemed a term to inexperienced users the easiest way to visualize how they spread and what their consequences. They are real viruses are not visible to the naked eye, and a computer less. In short, a computer virus (hereinafter: the virus) is a type of software that in some automated fashion spreads on computers and doing some damage on these computers. “Virus in the computer , the computer program that can infect other computer programs by modifying them in such a way that it involves the creation of their own copies.” It is good to point out that it is not necessary that this program needs to do some damage (such as delete or damage files) that it could be classified into a group of viruses. There is a clear difference between what Cohen considered a “virus” and what they would have the majority agreed it is a virus. Unnecessarily occupies space on the hard disk or memory (and thus slows down your computer, or slowing down your connection when you are connected to the Internet), whether you just throw a message that tells you that you are stupid (and you maybe mentally hit), either you erase your data on your computer, or changes (eg. financial data from January randomly mixed with the road), or, perhaps worst of all, send your contracts, image or some text of a private nature to a random e-mail address (maybe you can happiness and someone you know). From these findings it is clear that it takes some effort to make people who use computers have become aware of the existence of the virus and to prevent the continued indifference to this problem by creating it so actually even higher.
Moving data using radio frequency is not anything new nor unknown, what more Morse code is very similar to today’s Wi-Fi technology, it is a fact the first and only binary wireless transmission which the human species over the past 20 years, fostered the reproduction of human voice into an analog format. The phone has revolutionized the ability to mask the transmission of data, but this is left as the end point with regard to the military from around the world have continued with the construction of data through the RF transmitters. Wi-Fi is today a distant cousin Morse signals, although rather small bandwidth and sent thousands of bits of data every second, today it is measured in kilobits per second ace newer technologies and in megabits per second. Wi-Fi as standard uses ISM (Idustrial- Scientific, Medical) frequency range and tood 2.4 GHz to 2.4853 GHz (IEEE 802.11 b / g) and a range of 5.15 GHz to 5:35 GHz for IEEE802.11a. This range is largely untapped by European army and other RF users such as mobile communications. This frequency is further divided into channels from which a wireless device can use the transmittance data in order to avoid interference between frequencies with other devices and even to “jump” between secondary data streams. This gives a method for moving data over a RF-but each device must be connected and enabled to work with Wi-Fi, this is part of factors as to give each device of our network one remote radio (with the difference that they operate at much higher frequencies ). Through this radio link, binary data stream transmits data for example to a web page and back to the device that sent the request. Portable computers, for example, would have a Wi-Fi card or dongle (a device that can also transmit and receive) to connect to other portable computer and establish a point-to-point connection. However it is more likely that a portable computer or other client to connect to a specific wireless router or access point stewardship in order to join a much larger wireless network. The performance of any wireless link are limited by the same factors as radio TV signal , weather conditions , distance, power , walls or buildings . Another example is if you use the internal air signal , your TV signal is weaker, and this is expressed by poor image quality .With a Wi – Fi network if the signal is too strong or its quality, the effective data rate is reduced to more packet resend to correct the error, so it is important to bear in mind that the maximum possible speed Wi – Fi device may also be required as a minimum stable speed . Wi – Fi wireless networking , this is the best thing that happened to the global economy since the depression.
The first wireless network was discovered in 1971 at the University of Hawaii, to connect your computer to a four islands without using telephone lines. Without wire networking has entered the world of personal computing eighties, when the idea of exchanging data between the computer was very popular. Some of the first wireless networks were not using radio waves, but rested on primo infrared transmitters. The infrared connection has never prevailed, because infrared radiation can not pass through many physical objects. In addition, it requires all the time visible line between the receiver and the transmitter, which is a very difficult task in many offices. The infrared connection is not fast enough; even modern infrared devices still have a low throughput in the work. Wireless networks based on radio waves gain momentum in the early nineties, when processing chip becomes sufficient for the data to be sent and received using a radio connection. However, the former application was expensive and inconvenient – the network could not communicate with each other. Simple networks are bound to fail, so the middle of the decade draws attention to the recently adopted IEEE 802.11 standard for wireless communications. Early generations of 802.11 standard, ratified in 1997, has been relatively slow, allowing a throughput of one and later two megabits per second (Mbps) .will it is clear that this technology can penetrate even further, so that in 1999, Institute of Electrical and Electronics Engineers IEEE finished the 2.4 GHz IEEE 802.11b standard, increasing, in this way, network bandwidth to 11 Mbps. Although the IEEE, in fact, the first ratified the 802.11a standard, technical and political realities have slowed its development, so that the first 802.11 equipment was delivered in mid-2002. 802.11a far exceeds 802.11b speed, with bandwidth of 54 Mbps (she is 11 Mbps kod802.11b). However, hardware 802.11a is not compatible with 802.11b hardware, because 802.11aradi the frequency range of 5 GHz. So, it is the lack of standards – that led to the so-far producers sell to each other incompatible equipment. This lack of compatibility slows the acceptance of 802.11a .
Bluetooth is a technology that uses radio waves to establish a point- to-point and point- to- multipoint transfers voice and data within a radius of 10 meters. When two or more Bluetooth devices together, creating the so-called . piconet . Each piconet can contain up to 8 different devices (one master and seven slaves ), and more picon ( up to 10 , or a total of 80 devices) can be connected in scatternet . Radio waves are used to transfer many of information – from AM radio to a voice communication in cordless phones, so the Bluetooth uses radio waves because it is a simple and reliable technology. Radio waves are nothing but a pulse of electromagnetic energy, and is generated when the transmitter oscillates at a certain frequency – higher vibrations, the higher the frequency, and broadcast in a large range of frequencies. To avoid interference from the ISM band (and also to increase security), use spread spectrum frequency hopping technique, where the signal is switched from one to another frequency after each transmission. In the world of Bluetooth, this means that the Bluetooth radio is constantly changing frequencies in the ISM range after sending or receiving any data packets. The result is that Bluetooth transmission does not stay long enough at one frequency that there could be interference with other devices. According to the Bluetooth specification, Bluetooth radio can be 1600 times per second to change the frequency range from 2.402GHz to 2.480GHz range of 1 MHz, providing the output signal of only 1mW. The data (bits and bytes) are transferred using packet switching technology. With this technology, data is divided into small groups or packages before the transfer is made. One piece of data, divided into several packets can be transmitted over different frequencies in different order. When all packets received, the whole to be recreated on the receiving device. Voice is transmitted using circuit switching technology and unlike data is not shared on the packages, but establishes a dedicated channel during transmission. Bluetooth devices can simultaneously use packet switching and circuit switching, so that at the same time can transmit both voice and data. Bluetooth is designed so that its prices low. The biggest drawback of Bluetooth technology are limited distance, but an even greater disadvantage is the small maximum flow. Supports flow rates of 700 kb / s to support 721 kbit / s in one direction and in the opposite direction 57.6 kb / s or 432.6 kb / s in both directions symmetrically. The main strength of Bluetooth technology lies in its ability to transmit data and speech. Able to support an asynchronous data channel, and up to three synchronous voice channels or one channel to support voice and data. These capabilities along with possibilities for ad hoc topology, make Bluetooth a very good solution for mobile devices and Internet applications. They are generally organized into groups of two to eight devices called piconets and consisting of one master device and one or more slave devices . The device can belong to one or more piconet , or as slaves or in one piconet as a master , and the other as the slave . Two or more related piconet make scatternet . The link between the two piconet is a Bluetooth device that is a member of both piconets . Bluetooth device can receive and send data in a single volume, each piconet is synchronized to create a unique form on frequency hopping , which is moving through 1600 different frequencies within seconds.
Bluetooth is a technology which is for wireless transmission of data between devices that have the same technology. Bluetooth is a technology that enables communication between a PDA (personal digital assistant) devices, mobile phones, lap-top computers, PCs, digital cameras and video cameras, etc. BlueTooth device emits ultra-violet rays to other Bluetooth devices and so communication takes place that is feasible in two ways, chat and WiFi.BlueTooth device emits ultra-violet rays to other Bluetooth devices and so communication takes place that is feasible in two ways, chat and WiFi. Bluetooth is a wireless standard primarily intended for nisikopotrošnim devices, with a short range (from 10 cm – and up to 100m – a) and that in itself necessarily include transceiver. Bluetooth allows you to communicate these devices if they are within range (maximum of 100m-a), even though they are not in the same room. Not all devices the same range, it depends on the class to which the device belongs. Today when Bluetooth is already become a standard for networking on small remoteness, Bluetooth capabilities are different and are difficult to enumerate – from the original idea, connect a wireless headset with your mobile phone, via computer control with the help of mobile phone and data exchange between two mobile phones, and to finding a partner (toothing), controls freezers and microwave ovens as well as “wireless” writing with Bluetooth pen.
–The history of the development of bluetooth – Bluetooth is a technology that is named after the Danish King Harold Bluetooth in Gormson-in. Harold Plavozubi united the warring tribes of Sweden, Norway and Denmark, and therefore it was decided to obtain technology and named after him – a technology that will bring people and various devices together into a single network. Logo Bluetooth technology consists of a combination of the letters “H” and “B” Runic alphabet (the first letters of the names and surnames of the Danish king). The idea is coming from Bluetooth, born in 1994 when Ericsson Mobile Communications decided to investigate the possibilities of linking mobile phones with their appendices on cheap radio link with low power consumption. The idea was that in each unit installed small radio and thus kicked out of the use of cables. This standard was first developed by the company Ericsson and was later completed and published by the Bluetooth Special Interest Group (SIG). It is formed by several companies: Sony Ericsson, IBM, Intel, Toshiba and Nokia, but were later joined by the other kompanije.IEEE 802.15 is working group that belongs to the IEEE 802 (specializing in the development of wireless networks PAN), which is divided into 4 groups and one group (IEEE 802.15.1) is responsible for the Bluetooth smart card. A year later, the real potential of this idea began to crystallize. The main research activities carried out in Ericsson’s laboratory in Lund, Sweden by Dr. Sven Mattisson and Dr. Jaap Haartsena, today and take “parents” Bluetooth technology. Ericsson is before the adoption of the name Bluetooth technology called “Multi-Link Communicator” (MC link). The original idea was to connect a wireless headset with your mobile phone, and that you have found it in the same way can connect most electronic devices, it was, in their words – a happy coincidence. In early 1997, Ericsson did something completely unexpected – decided to Technology does not naplaćauju, and all interested companies gave free license, because it was the best way to become a global technology standard. Ericsson has started talks with companies from different spheres of production of electronic equipment (Nokia – mobile phones, IBM and Toshiba – portable computers and Intel – chips for digital signal processing) in order to establish a consortium that will further develop and promote technology. Bluetooth technology was officially presented to the public on May 20, 1998, when five companies, Ericsson, IBM, Intel, Nokia and Toshiba, held simultaneous press conference in London, Tokyo and San Jose, where it was announced that the five companies joined together in order to develop a free technology, open specification for wireless networking, and the organization behind it, called the Special Group intrests.
Microsoft PowerPoint is a program for creating presentations and is an integral part of Microsoft Office. PowerPoint is one of the simplest of computer programs. It is equally useful in the business world as well as classrooms, and is the most widely used tool for creating presentations. Anyone can create stunning presentations that look like they were designed by professionals. With it you can quickly and easily design and create various presentation materials according to their own needs, whether it be a presentation on the screen, web presentation, projection foils, supporting brochures … PowerPoint presentations consist of a number of individual pages or “slides”. Slides may contain text, images, animation, sound and other objects, which can be freely edited. Combining text, tables, charts, illustrations, video and audio clips into a meaningful whole, coming to effective presentations. In this way, you create a powerful tool that considerably faster and better convey information and ideas.
PowerPoint is started like any other Windows application. The simplest way is to find a shortcut icon on your desktop and double -click to run the program . If you do not have PowerPoint desktop shortcut , you can select it from the menu.