Using ImageIO to read a bmp file

[ying lam]

Hi,

I have this piece of code which read bmp file from disk:

    
File f;
BufferedImage image = ImageIO.read(f);

I get an image object when i run the program under java 1.6.
But when i run the same program under java 1.4, image is null.

Can you please tell me how can I get imagIO onjava 1.4 to read bmp file?

Thank you.

[Ilja Preuss]

Have you tried to explicitly use a newer version of JAI? https://jai.dev.java.net/

[Ulf Dittmer]

Support for BMP images wasn't added to ImageIO until Java 5.

You should be able to grab the sources for the GNU ImageIO BMP implementation, and use those with Java 1.4. That would still allow you to use ImageIO.

I wouldn't use JAI for image loading/saving; my impression is that it's been abandoned for the most part.

[ying lam]

Thank you.

I take all the source from 'http://www.docjar.com/docs/api/gnu/javax/imageio/overview-summary.html'

I am not sure how can i call the BMPDecoder to decode a bmp image?

Thank you.

[Ulf Dittmer]

The only thing your code needs to do is register the classes with ImageIO; something like this:

import javax.imageio.spi.IIORegistry;
 
IIORegistry registry = IIORegistry.getDefaultInstance();
registry.registerServiceProvider(new gnu.javax.imageio.bmp.BMPImageReaderSpi());
registry.registerServiceProvider(new gnu.javax.imageio.bmp.BMPImageWriterSpi());

Then you can just use ImageIO.read as if ImageIO supported BMP natively.