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javaarraysimagebyte
Señor Reginold Francis
Señor Reginold Francis

Reputation: 16906

Byte Array to Image object

I am given a byte[] array in Java which contains the bytes for an image, and I need to output it into an image. How would I go about doing this?

Much thanks

Upvotes: 62

Views: 132254

Answers (5)

Sam Barnum
Sam Barnum

Reputation: 10714

If you know the type of image and only want to generate a file, there's no need to get a BufferedImage instance. Just write the bytes to a file with the correct extension.

try (OutputStream out = new BufferedOutputStream(new FileOutputStream(path))) {
    out.write(bytes);
}

Upvotes: 26

Usman
Usman

Reputation: 1136

From Database.
Blob blob = resultSet.getBlob("pictureBlob");               
byte [] data = blob.getBytes( 1, ( int ) blob.length() );
BufferedImage img = null;
try {
img = ImageIO.read(new ByteArrayInputStream(data));
} catch (IOException e) {
    e.printStackTrace();
}
drawPicture(img);  //  void drawPicture(Image img);

Upvotes: 6

Nick Veys
Nick Veys

Reputation: 23939

BufferedImage img = ImageIO.read(new ByteArrayInputStream(bytes));

Upvotes: 100

Kevin Loney
Kevin Loney

Reputation: 7553

Since it sounds like you already know what format the byte[] array is in (e.g. RGB, ARGB, BGR etc.) you might be able to use BufferedImage.setRGB(...), or a combination of BufferedImage.getRaster() and WritableRaster.setPixels(...) or WritableRaster.setSamples(...). Unforunately both of these methods require you transform your byte[] into one of int[], float[] or double[] depending on the image format.

Upvotes: 2

Platinum Azure
Platinum Azure

Reputation: 46183

According to the Java docs, it looks like you need to use the MemoryImageSource Class to put your byte array into an object in memory, and then use Component.createImage(ImageProducer) next (passing in your MemoryImageSource, which implements ImageProducer).

Upvotes: 1

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