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- Y JCompuServeY hVID-243
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- "WHAT IS GIF?"
- Updated 26-OCT-87
-
- INTRODUCTION
-
- CompuServe has developed a new Graphics Interchange Format (GIF) designed to
- serve a wide variety of graphics needs both within the CompuServe product
- environment and as a universal standard by which graphics can be exchanged
- between any parties through a network. This document serves as a simple
- explanation of what GIF is and what it is capable of.
-
- WHAT IS GIF?
-
- GIF (pronounced "Jif") is a mechanism of storing high-quality color graphics
- images in a way that can be exchanged between users of differing hardware. For
- example it allows images created on an Atari ST to be displayed on a Commodore
- Amiga or IBM-PC and visa versa. The GIF format allows for very high resolution,
- full color images that can be used in any application that requires the display
- of graphics information.
-
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- WHAT KIND OF IMAGES CAN GIF BE USED FOR?
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- GIF images can be part of, but not limited to the following applications:
-
- - Full color personel photo board
- - Business charts and graphics
- - Merchandise catalogs
- - Technical documentation
- - Schematic diagrams for field service personnel
- - Color radar maps
- - Medical illustrations
- - Art gallery
- - Exchange of user-created images
-
- HOW MUCH RESOLUTION CAN AN IMAGE HAVE?
-
- In terms of pixels, or image dots, GIF is capable of defining images of over
- 16,000 by 16,000 individual dots. This compares with the average microcomputer
- screen of 320 by 200 pixels. Even laser printers are generally limited to about
- 2000 by 3000 pixels. GIF technology is adequate for graphics applications for
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- years to come.
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- HOW MANY COLORS CAN A GIF IMAGE HAVE?
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- Any GIF image can have up to 256 simultaneous colors contained within it. Each
- individual color can be defined out of a possible set of 16 million colors,
- making photographic-quality images possible.
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- DOES THIS MEAN AN IBM-PC CANNOT DISPLAY GIF IMAGES WITH 256 COLORS?
-
- All GIF images can be processed by all GIF software. The software is designed
- to make the best use of a specific hardware's capabilities with regard to
- colors. A best match is made between a desired color in the image, and the
- possible colors the hardware can display. Generally, detail of an image will be
- lost, but it should still be recognizable. On the other side, any image
- originating from an IBM machine should display exactly on a more capable
- microcomputer.
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- HOW LARGE ARE THE IMAGE FILES IN GIF?
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- This will vary a great deal depending on the number of colors present, the size
- of the image and the amount of detail present. GIF uses a sophisticated
- compression method that reduces the file size to between 1/2 to 1/8 of the
- original file size of the image. This means that even complex images can be
- economically downloaded. An example is an Atari ST image file of 320 by 200
- pixels and 16 colors which would require 32,000 bytes on the Atari might only
- require 8,000 bytes in GIF format, a space savings of 4 to 1.
-
- WHAT MICROS CAN SUPPORT GIF?
-
- Currently CompuServe has developed software for a number of microcomputers to
- display or create GIF format files. Additional hardware will be supported as
- time goes on. The GIF standard document will be made public and third party
- authors will be encouraged to create additional GIF software for other hardware.
- Machines supported currently include:
-
- - IBM-PC/MS-DOS family with CGA, EGG and Hercules monochrome graphics boards
- - Commodore Amiga
- - Atari ST
- - Macintosh family
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- - Apple 2 family
- - Tandy Color Computer 3
-
- The software files can be found in the Picture Support Forum (GO PICS) and in
- the appropriate hardware FORUMS.
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- WHERE ARE THE GIF FILES THAT CAN BE DISPLAYED?
-
- Currently many GIF files are available in the Data Libraries of the Picture
- Support Forum. Each appropriate hardware forum will also accumulate GIF files
- as time goes on. The CompuServe FORUM software has a GIF file type established
- for upload and display of GIF image files. In the future CompuServe will
- enhance existing products and add new ones that support GIF.
-
- CAN GIF fILES BE DISPLAYED ONLINE?
-
- CompuServe's newest terminal software package, the Professional Connection 3.1,
- supports display of GIF image files while online. Additionally, other software
- vendors are developing terminal software that also supports online viewing of
- GIF image files. Please check "What's New" for information concerning GIF
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- viewing online and the associated terminal software programs.
-
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- Last page !
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- Y& GIF (GRAPHICS INTERCHANGE
- FORMAT)
-
- 1 What is GIF?
- 2 Gif Standards
- 3 GIF Graphics Demonstration
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- Enter choice !3
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- Y& 1 F-15 Strike Eagle
- 2 PICS Forum Logo
- 3 The Blue Dragon
- 4 Multi-color U.S. Map
- 5 Porsche 911
- 6 Bell 222B Helicopter
- 7 Sports Car
- 8 3-D Fractal
- 9 Hitchhikers Guide
- 10 Bees
- 11 U.S. Weather Map
- 12 BP Forum Logo
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- Enter choice !9
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- Y& The famous DON'T PANIC slogan
- from THE HITCHHIKERS GUIDE TO
- THE GALAXY. 320 by 200
- resolution with 16 colors.
- Size: 3584 bytes
-
- 1 Display GIF file online
- 2 Download GIF file
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- Enter choice !