Multimedia on Web
Multimedia is an application that uses text with grphics, animation, audio, video and virtual reality. The use of multimedia makes websites more attractive and interesting for the, people. The websites with multimedia contents take more time to download. Multimedia consists of the following:
Graphic or graphical image is the digital form of chart, photOgrpah or drawing. Many websites use different colorful graphics, logos and charts to present information in an attractive way. The use of graphics increases the size of web page.
Two commonly used graphic formats are JPEG and GIF. JPEG format compresses graphics and reduces its size. Compression reduces the size but also decreases the quality. GIF format also compresses images. This format is suitable for the images with a few distinct colors such as line drawings, borders etc. A new format PNG is an improve form of GIF format. BMP, PCX and TIFF formats are heavy in size and are not used on the Web normally. Many websites use thumbnails of images. Thumbnail is a small version of a larger graphics.
Animation is the display of motion by displaying a series of still images in a sequence. It makes websites more attractive and lively. Scrolling text is an example of animation. Animation easily captures the attention of the user. Animated GIF. is a popular type of animation. it is actually a set of different images combined into a single GIF file.
Audio includes music, speech and other sounds. Audio is stored as individual sound files on the Web. Different formats of audio files are MP3, way, WMA, MPEG, RealAudio and QuickTime. Audio files are also compressed to reduce size.
Some applications on the Web use streaming audio. Streaming, is a process of transferring data in a continuous and even flow. With streaming audio, the user can listen to the music as it is downloading. MP3, QuickTime, Windows Media Format and RealAudio are accepted standards for transmitting streaming audio data on the Internet.
Video is a set of full-motion images played at various speeds. Many videos also contain audio as well. Many websites provide live telecast of matches and shows. The users can download the video files from websites and watch them on their computers. Video ifies are found in different formats and are normally compressed to reduce their size. Moving Pictures Experts Group (MPEG) defines a popular video compression standard. The current standard is known as MPEG-4.
Streaming video allows the user to view video as it is downloading. Most commonly used streaming video standards are AVI (Audio Video Interleaved), QuickTime, Windows Media Format and RealVideo.
5. Virtual Reality.
Virtual reality is a technique used to simulate a real or imaginary environment that
appears in three-dimensional space. Virtual reality software create indefinite space and depth known as VR world. Jt can display a building with furniture and equipments. The user
can view the building on the computer by virtually moving the input device.
Virtual reality is commonly used in 3-D games. It is also used to create simulations of
scientific structures, products and buildings etc.
Plug-in is a program that extends the capabffity of a web browser. Web browsers can
display basic multimedia elements. Sometimes, they require plug-ins to display some files. Different plug-in programs are as follows: