How to convert Image to BufferedImage in Java?

Question

How to convert Image to BufferedImage in Java?

Note, that existing answer is apparently not correct, because it uses methods getWidth(null) and getHeight(null), which can return -1 if image is not loaded yet (Image is, by definition, an asynchronous object).

Please, provide either more correct answer, or more proofs that existing answer is already correct.

You need to create an empty BufferedImage to copy the pixels to. Therefore you will need the dimensions of the original image. — Stefan
– Stefan, Commented Sep 22, 2015 at 10:43
I can't know the dimensions of original image until it's loaded. — Dims
– Dims, Commented Sep 22, 2015 at 10:57
o gosh I tried converting two images to bufferedImages and I was getting really close to a tantrum cause I did not understand why one would convert and the other not :) I had to load both before as setIcon and setRolloverIcon to my JButton before altering, that did the trick thanks a lot :) — Georodin
– Georodin, Commented May 4, 2021 at 17:59

MadProgrammer · Accepted Answer · 2015-09-22 11:03:05Z

4

If it's important to you, you can use a MediaTracker to "wait" for the image to be loaded, then you don't need to care about supplying a ImageObserver

try {
    MediaTracker mt = new MediaTracker(new JPanel());
    Image image = Toolkit.getDefaultToolkit().createImage("...");
    mt.addImage(image, 0);
    System.out.println("Wait for...");
    mt.waitForAll();
    System.out.println("I be loaded");

    BufferedImage bi = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);
    Graphics2D g2d = bi.createGraphics();
    g2d.drawImage(image, 0, 0, null);
    g2d.dispose();
} catch (InterruptedException ex) {
    ex.printStackTrace();
}

Have a look at MediaTracker JavaDocs for more details

I don't wish to add any GUI, I just need to download image or fail

Okay, if you "need to download" the image, then you can just use ImageIO.read(URL), have a look at Reading/Loading an Image for more details ... then you won't need to care about Image or MediaTracker, as ImageIO returns a BufferedImage

edited Sep 22, 2015 at 11:03

answered Sep 22, 2015 at 10:53

MadProgrammer

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4 Comments

Dims Over a year ago

What is the purpose of Component in MediaTracker's constructor? I don't wish to add any GUI, I just need to download image or fail

MadProgrammer Over a year ago

The Component is acting as the ImageObserver for the MediaTracker. Okay, if you "need to download" the image, then you can just use ImageIO.read(URL), have a look at Reading/Loading an Image for more details ... then you won't need to care about Image or MediaTracker, as ImageIO returns a BufferedImage

Dims Over a year ago

I don't have URL, I have an image in Image instance form

MadProgrammer Over a year ago

Then you need the MediaTracker, the creation of the Component won't "start" any UI, it's just using it to facilitate the ImageObserver API reqiurements

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