Re: Newbie Image class question

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.help
Date:
Thu, 27 Jul 2006 17:27:55 -0700
Message-ID:
<TRcyg.19649$ak6.5433@newsfe06.phx>
fiziwig wrote:

I have an image in an ImageIcon that I need to BASE64 encode for
transmission. How do I get the pixel bytes from an Image object?


You can't easily.

Image.getSource() gets me something called an ImageProducer, (whatever
that is) but I don't see how that gets me any closer to being able to
turn the actual image into an array of bytes so I can encode them.


It won't help you.

What I seem to need is the OPPOSITE of the ImageIcon constructor:
ImageIcon(byte[] imageData) that will get me back the image data as a
byte array, but there doesn't seem to be such a method in the ImageIcon
or Image class.


Doesn't exist.

Any hints or clues would be deeply appreciated.


Don't use ImageIcons as the class to load images with. Use the methods
from the ImageIO class. That will give you a BufferedImage that has a
method to return the actual byte values of the pixels.

If you are using an ancient version of the VM then you can:

1) get the Image from your ImageIcon
2) create a BufferedImage of the same dimensions
3) draw the Image onto the BufferedImage
4) recover the pixel values from the BufferedImage

My best suggestion is to use the modern classes and methods.

--

Knute Johnson
email s/nospam/knute/

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