Using the JPEGImageReader about twelvemonkeys

[haraldk]

Hi again,

Still sorry about the state of the documentation. :-/

You should be able to use it just like normal ImageIO. No changes required. You do however need all of the dependencies of the imageio-jpeg plugin in classpath as well.

You probably need all these (update: fixed some typos):
twelvemonkeys-common-lang-3.0-SNAPSHOT.jar
twelvemonkeys-common-io-3.0-SNAPSHOT.jar
twelvemonkeys-common-image-3.0-SNAPSHOT.jar
twelvemonkeys-imageio-core-3.0-SNAPSHOT.jar
twelvemonkeys-imageio-metadata-3.0-SNAPSHOT.jar
twelvemonkeys-imageio-jpeg-3.0-SNAPSHOT.jar

Hope that helps.

If not, let me know how/in what way it does not work, and I'll look into it.

Regards,

Harald K

[Fanvaron]

Hello Harald,
that helped me thanks, but I'm still not sure how to call the read() method, what do I need to import and where do I get my object, or is there a static method somewhere that I overlooked?
Maybe a very simple example would help me.

Thanks

[haraldk]

When you have everything set up on class path, it really is as simple as:

BufferedImage image = ImageIO.read(jpegFile);

No special imports, no special method. The reason this works, is that ImageIO is plugin-based, and the plugin is automatically registered using SPI (service provider interface). If you want to learn more about how this works, I suggest you read http://docs.oracle.com/javase/7/docs/api/javax/imageio/spi/IIORegistry.html and http://docs.oracle.com/javase/7/docs/technotes/guides/jar/jar.html#Service_Provider :-)

The only exception (of course there's one) I know of, is if you add the plugins to the class path after ImageIO has been initialized (like in a web app), then you might have to add the line:

ImageIO.scanForPlugins();

Make sure you do this only once. If you are indeed doing this from a web app, you should also read http://stackoverflow.com/a/17365294/1428606 to avoid adding a memory leak to your application.

Ok, long answer, but I think that covers most of it. :-)

Best regards,

Harald K

[Fanvaron]

Woho it works now!
thanks, yeah I always made the mistake and didn't import the ImageIO.
Thanks as well for the background info that looks really interesting.

[haraldk]

Cool. Happy coding! :-)