How to turn a byte[] into an image?

My app downloads image data from a server, storing the data in a byte[] called imageDataByteArray.
I want to use imageDataByteArray to create an image. For this, I have tried using:
int w = imageWidth; //488
int h = imageHeight; //245
int imageOffset = 0;
int scan = w;
Image image = component.createImage(new MemoryImageSource(w, h, java.awt.image.ColorModel.getRGBdefault(), imageDataByteArray, imageOffset, scan));
...but the image created is empty.
I think the length of imageDataByteArray is a problem - it's length is only 21461, whereas the number of pixels in the image ( = imageWidth * imageHeight) is 119560.
I've played around for a while, but cannot solve. Can anyone help?

Hiya Rodney,
Yes, it's in jpg format. I've tried your code but the image does not display correctly.
To shed some more light, here's how I'm getting the image:
I am using standard http code to connect to the image url (http://www...../image.jpg) which returns the image data as a String, called httpContent. I then convert this String to imageDataByteArray with httpContent.getBytes[] - but am obviously struggling to recreate the image.
Any ideas where I might be going wrong?
Thanks,
James

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* You have the right to use this code in your own project or publish it
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* If you are going to use this code, please include the author lines.
* Use this code at your own risk. The author does not warrent or assume any
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