ImageIO : Java Glossary

2006-02-13 by Roedy Green ©1996-2008 Canadian Mind Products
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ImageIO

javax.imageio.ImageIO lets you save and restore Images to disk in a platform independent format. It works using plug-in modules that handle various formats including "gif", "png" and "jpeg" (all lower case, or all upper case, but not mixed). "jpeg" or "jpg" is acceptable. Use ImageIO.getWriterFormatNames() to find out which types are supported on your machine.

With ImageIO, instead of Image you use BufferedImage which is a subclass of Image, and can thus be used in any of the familiar tools that work with Images. Introduced with Java 1.4.

raw bytes ⇒ BufferedImage	URL ⇒ BufferedImage
Image ⇒ raw bytes	Image ⇒ BufferedImage
File ⇒ BufferedImage	Learning More
BufferedImage ⇒ File	Links

Loading an Image from raw bytes

Here raw bytes represent the image of a *.gif, *.png or *.jpg file in RAM.

Saving an Image to raw bytes

Loading a BufferedImage from a file

// file to BufferedImage
import java.awt.image. BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
...
BufferedImage image = ImageIO.read( new File( "rabbit.jpg" ) );

Saving a BufferedImage to a file

Loading a BufferedImage from an URL

Converting Image to BufferedImage

JAI has a set of

Sun’s Product Info on download plugins

for the much simpler ImageIO class, that will for example let you process TIFF files with ImageIO.

Learning More

Sun’s JDK Technote Guide on imageio packages : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 on your local J: drive.

Sun’s Javadoc on the ImageIO class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in the older JDK 1.5.0_15 or the even older JDK 1.4.2_17 on your local J: drive.

BufferedImage
gif
GIF encoder
Image
ImageInfo
JAI
JPEG encoder
jpg
Marco Schmidt’s List of Pixel format read/write Libraries
Marco Schmidt’s List of Vector Image Libraries
png
PNG encoder
RasterMaster

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