9-2-1 Multimedia technology
9-2
Multimedia
9-2-1 Multimedia technology
“ Multimedia” refers to the combined use of various types of data in addition to letters and numbers, including static images, video, and audio. With advances in computer technology, the use of data such as static images, video, and audio files has become increasingly common. After converting this analog data into digital data according to certain rules, it is used in“ Web content”,“ hypermedia”,“ streaming”, and other media.
1 Multimedia file types
Multimedia includes static images, video, and audio.
●Static images The types of static image formats and their characteristics are summarized below.
File type Extension
JPEG. jpg. jpeg
Characteristics
A fi le format for compressing and storing static images. It supports 24-bit full color( 16.77 million colors) images and is suited for photographs and other data that includes a wide range of colors. It is used as the image format for digital cameras and other devices. It employs lossy compression so there is deterioration in quality. The compression rate can be changed.
GIF |
. gif |
A fi le format for compressing and storing static images. It supports 8-bit color( 256 colors) images and is suited for graphics and other data with limited color variation. It employs lossless compression, so there is no deterioration in quality. The compression rate cannot be changed. |
BMP |
. bmp |
A file format for storing static images as a collection( or map) of dots. The images are not compressed, so the size of the fi le is relative to the size of the image and the number of colors. It is a standard format on Windows. |
TIFF
. tif. tiff
A fi le format for storing static images. It was developed by Microsoft and Aldus( now Adobe Systems) and can save image data of different formats. Attribute information on the recording format is placed in what is called a“ tag” at the top of the image data, and the image is rendered according to this information, so it can record images regardless of resolution, number of colors, etc. The user can also choose whether or not to compress the data. It employs lossless compression, so there is no deterioration in quality.
PNG |
. png |
A fi le format for compressing and storing static images. It |
|
|
supports 48-bit color images. It employs lossless compression |
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|
, so there is no deterioration in quality. |
Reference
Web content“ Web content” is a generic term that refers to information and data accessed on Internet browsers, including static images, video, audio and text.
Reference Hypermedia“ Hypermedia” is used as a logical extension of the term“ hypertext,” which applies to text, and is a media format that links text, images, audio, and other objects together in an easily accessible manner.
Reference
Streaming“ Streaming” refers to a technology for efficiently distributing and playing back audio files, video, and other Web content. The data is played back while it is being downloaded, so the user does not need to wait for the download to complete. It makes it easier to watch videos and listen to music on the Internet.
Reference
PDF“ PDF” is a file format created by Adobe Systems’ Acrobat software. When converting documents created using word processing software into PDF format, the data can be compressed to reduce the file size. For this reason, it is widely used for distributing electronic documents. PDF files cannot be edited using the original software. Abbreviation for“ Portable Document Format.”
Reference
Compression rate“ Compression rate” refers to the ratio of data compression. The higher the compression rate, the smaller the file size.
Chapter 9 Technology Chapter element 5
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