Using an image as an alpha map

[Aarem]

Hi. I'm still new to java, and I was wondering what the best way is to take one image, and display it, but with a transparency map (a seperate image). Maybe something with pixelGrabber to get the brightness of each pixel in the alpha map? Please help!

 

[sedj]

In a web page or in a Swing/AWT app ?

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[Aarem]

In a web page applet

 

[sedj]

If you are using an applet, then that is using Swing/AWT. Which means you will have to use the JAI API :

http://java.sun.com/products/java-media/jai/

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[Aarem]

I'm not quite clear on how to use this. Could you give me an example?

 

[sedj]

You will need to create one image with an alpha channel (RGBA), and then overlay that image over that ... I would suggest looking at the JAI API and trying yourself ... and then coming back with some code you have tried to get to work (we're not here to hand out free code --- thats called consultancy !!!). You might want to read the link I gave you before and look at the JAI Programmers guide - this is how everyone else learns JAI. There is also a mailing list fro JAI (see java.sun.com's mailing lists).

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