May 1999
Intermediate to advanced
368 pages
9h 6m
English
Content preview from Java 2D Graphics
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1.6. File Formats
There are many, many ways to store graphics information in a file. In this section I'll briefly describe two formats, GIF and JPEG. These formats are common currencies of the Internet—any web browser that shows images knows how to show GIF and JPEG images. Similarly, the JDK can load and display GIF or JPEG images.
For more detailed information on these formats, or on other popular graphics file formats, see the Encyclopedia of Graphics File Formats , by James D. Murray and William vanRyper (O'Reilly).
1.6.1. GIF
GIF stands for Graphics Interchange Format. GIF images can have 2 to 256 colors and are compressed before being stored. The compression algorithm is lossless, which means that the original picture will be restored verbatim when the image is decompressed and displayed.
There are actually two common flavors of this format, GIF87a and GIF89a. GIF89a offers the option of designating one of the image colors as transparent. Applications that know how to show GIF89a images correctly will allow the background to show through the transparent areas of the image. You've probably seen these "transparent GIFs" in web pages.
GIF89a also supports simple animations, which you've probably seen in web pages. These are called animated GIFs ; they've been supported in Java since JDK 1.1. For more information on animated GIFs, see GIF Animation Studio by Richard Koman (published by Songline Studios, Inc.).
1.6.2. JPEG
JPEG stands for Joint Photographic Experts Group ...
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