October 2002
Intermediate to advanced
368 pages
7h 12m
English
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The GD Library
PHP provides the ability to create and manipulate images through support of the GD library. The GD home page is located at www.boutell.com/gd/ and lists the definition of GD as:
“An ANSI C library for the dynamic creation of images. GD creates PNG and JPEG images, among other formats. GD does not create GIF images.”
Previously, GD was widely used for creating GIF images, but Unisys Corp., the company which owns the patent for the LZW compression algorithm used in GIF images, recently started enforcing their patent rights, and GIF creation was subsequently dropped from the list of GD features.
However, GD can still be used to create JPEG and PNG graphics, both of which are supported by most of the popular Web browsers. In addition, ...
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