Data Compression


Criteria

Survey Formats

Basics

Compression Methods

Data Formats

Files

Audio Data

Image Data

GIF

Colours

Data Compression

Characteristics

GIF87a

GIF89a

Patents

Optimizations

Examples

Drawings

JPEG

Video Data


Glossary

Index


Download


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GIF - Graphic Interchange Format


The development of the Graphic Interchange Format goes back into the 80's and thus into the time of electronic mailboxes. At that time different providers operated private and commercial mailbox systems, which simply communicated via telephone lines by acoustic couplers or modems. Characteristics of these connections were extremely small data transfer rates, compared with today's standards.


Market leader was the company CompuServe, which operated a world-wide commercial network. In order to open the communication for graphic files, the Graphic Interchange Format format was created. Until then the information transfer primarily based on text transfer.


The first version of this standard is dated on 1987 and is denoted as GIF87a. In 1989 an extended version appeared, called GIF89a, which is used until today in the internet as standard format.


In principle GIF is an open format, but for the data compression the LZW procedure is used internally. This is protected by patents, so that applications generating GIF files must be licenced accordingly.


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 GIF - Patents 

Image Data Compression Image Data Compression GIF - Colours