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Image watermarking with transparency
Posted:
Apr 22, 2008 4:53 AM
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Hi guys,
I'm a newbie to JAI and need to implement a watermarking functionality. I have a logo (png) which I intend to use as a watermark on my photos that I post online (jpegs). I want the logo to be just slightly visible on my pictures.
Can someone please give me pointers on how I can achieve this? I've trawled around on the forums a bit but still no joy.
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Re: Image watermarking with transparency
Posted:
Apr 22, 2008 8:32 AM
in response to: abisola
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Helpful |
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You might not need JAI at all. But something like this is a perfectly suitable naive implementaiton:
File waterMarkFile;
File inputFile;
File outputFile;
BufferedImage waterMark = ImageIO.read(waterMarkFile);
// You probably want to loop the rest if you have many images
BufferedImage image = ImageIO.read(inputFile);
Graphics2D g = image.createGraphics();
try {
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));// 50% transp
g.drawImage(waterMark, image.getWidth() - waterMark.getWidth(), image.getHeight() - waterMark.getHeight(), null);// draw in lower right corner
}
finally {
g.dispose();
}
ImageIO.write(image, outputFile);
Regards,
.k
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Re: Image watermarking with transparency
Posted:
Apr 22, 2008 9:16 AM
in response to: haraldk
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Thanks .k
Your code snippet was very helpful! I didn't need JAI afterall 
You're a genius!
a.f.
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Re: Image watermarking with transparency
Posted:
Apr 23, 2008 5:04 PM
in response to: abisola
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This raises a good point. While we would love you to use JAI (or JAI Image I/O Tools), if there is no point in doing so and you can get away with what Java 2D (or core Java Image I/O) has to offer. It is also better to have a thorough understanding of these core APIs before moving to the optional packages.
Brian
> Thanks .k
>
> Your code snippet was very helpful! I didn't need JAI
> afterall
>
> You're a genius!
>
> a.f.
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Re: Image watermarking with transparency
Posted:
Apr 23, 2008 12:39 AM
in response to: haraldk
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Thanks, I needed it too!
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