This chapter examines the Image
class and the java.awt.image
package. Together, they provide support for imaging
(the display and manipulation of graphical images). An image is simply a rectangular graphical object. Images are a key
component of web design. In fact, the inclusion of the <img> tag in the Mosaic browser at NCSA (National Center for
Supercomputer Applications) is what caused the Web to begin to grow explosively
in 1993. This tag was used to include an image inline with the flow of hypertext. Java expands upon this basic
concept, allowing images to be managed under program control. Because of its
importance, Java provides extensive support for imaging.
Images are objects of the Image
class, which is part of the java.awt
package. Images are manipulated using the classes found in the java.awt.image package. There are a
large number of imaging classes and interfaces defined by java.awt.image, and it is not possible to examine them all.
Instead, we will focus on those that form the foundation of imaging. Here are
the java.awt.image classes discussed
in this chapter:
These are the interfaces that we will use:
Also examined is the MediaTracker
class, which is part of java.awt.