September 2001
Intermediate to advanced
640 pages
31h 42m
English
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Chapter 19. GIF Format
GIF (Graphic Interchange Format) was the first graphic file type to be displayed by early web browsers, and it remains the most popular and versatile format for distributing color images on the Web to this day. Any image can be saved as a GIF, but they excel at condensing graphical images with areas of flat color.
GIFs are completely platform-independent, meaning a GIF created on any platform can be viewed and edited on any other platform. They were originally developed by CompuServe to distribute images over their network to a variety of platforms (this is why you sometimes see GIFs referred to as “CompuServe GIF”).
It is also the only graphic file format that is universally supported by all graphical browsers, regardless of version. If you want to be absolutely sure everyone will see your graphic, make it a GIF.
GIF87a Versus GIF89a
There are technically two types of GIF
file: GIF87a and the newer, improved GIF89a. Both are fully supported
on most browsers, and both use .gif as their
file name suffix.
GIF87a is the original format for indexed color images. It uses LZW compression and has the option of being interlaced.
GIF89a is the same, but also includes transparency and animation capabilities (animation is discussed in Chapter 23). If you want to add these features to your graphic, you’ll need to create the graphic with a tool that supports the GIF89a format. These features have become so popular with web developers that this format has become thede ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.