How to convert byte[] to BufferedImage in Java

The conversion from byte[] to BufferedImage is involved the use of InputStream and ImageIO.read as following :

InputStream in = new ByteArrayInputStream(imageInByte);
BufferedImage bImageFromConvert = ImageIO.read(in);

The following example will read an image file named “darksouls.jpg“, convert it into byte array, and then reuse the converted byte array, and convert it back to a new BufferedImage, and save it back into a new name “new-darksouls.jpg“.

package com.mkyong.image;
 
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
 
public class ImageTest {
 
	public static void main(String[] args) {
 
		try {
 
			byte[] imageInByte;
			BufferedImage originalImage = ImageIO.read(new File(
					"c:/darksouls.jpg"));
 
			// convert BufferedImage to byte array
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			ImageIO.write(originalImage, "jpg", baos);
			baos.flush();
			imageInByte = baos.toByteArray();
			baos.close();
 
			// convert byte array back to BufferedImage
			InputStream in = new ByteArrayInputStream(imageInByte);
			BufferedImage bImageFromConvert = ImageIO.read(in);
 
			ImageIO.write(bImageFromConvert, "jpg", new File(
					"c:/new-darksouls.jpg"));
 
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
	}
}

mkyong

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/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package javaapplication3; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.File; import java.io.IOException; import java.io.InputStream; import javax.imageio.ImageIO; /** * * @author Bhavesh */ public class JavaApplication3 { public static void main(String[] args) { // TODO code application logic here try { InputStream in = new ByteArrayInputStream(hexToBytes("CD302C16E7D853D5A9012AB7AD3C35310EDD55AFAE1618738C938300F43F852608A0600D2D00381C5381CD301D4B8A042814EC50025324380681922279717B9A4A620A36D9A889E6A0A400D3BAD265125ADA")); BufferedImage bImageFromConvert = ImageIO.read(in); ImageIO.write(bImageFromConvert, "jpg", new File("f:/new-darksouls.jpg")); } catch (IOException e) { System.out.println(e.getMessage()); } } public static byte[] hexToBytes(char[] hex) { int length = hex.length / 2; byte[] raw = new byte[length]; for (int i = 0; i < length; i++) { int high = Character.digit(hex[i * 2], 16); int low = Character.digit(hex[i * 2 + 1], 16); int value = (high << 4) | low; if (value > 127) value -= 256; raw[i] = (byte) value; } return raw; } public static byte[] hexToBytes(String hex) { return hexToBytes(hex.toCharArray()); } }

InputStream in = new ByteArrayInputStream(rsvalue.getBytes(10)); BufferedImage bImageFromConvert = ImageIO.read(in); ImageIO.write(bImageFromConvert, "jpg", new File("D:\\"+ rsvalue.getString(2) +".jpg"));

Amir Husain Meysami (???? ???? ?????) January 26, 2013 at 7:26 pm
Thank You Mr.Yong
God Bless u.
Jacek November 14, 2012 at 5:06 am
Hi.
I read form file to byte array. In next step i change image size and write as byte array to screen. It’s work fine.
Thanks for tutorial.
nico August 15, 2012 at 3:25 pm
i need help on showing images from database to my jsp page. I am using Spring+Hibernate Framework. i am getting String when i get the blob from the pojo. can i get image directly from the pojo? thanks
Manuel July 1, 2012 at 1:15 pm
Hola Amigos .. aca tengo una duda .. veo la imagen en mi aplicacion y todo bien .. el problema es como hago para guardar la imagen capturda de una webcam .. trate de acer esto . pero solo llege hasta aqui !! …
try{
Image img=null;
FrameGrabbingControl fgc = (FrameGrabbingControl)
player.getControl(“javax.media.control.FrameGrabbingControl”);
Buffer buf = fgc.grabFrame();
// creamos la imagen awt
BufferToImage btoi = new BufferToImage((VideoFormat)buf.getFormat());
img = btoi.createImage(buf);
if (img != null)
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write((RenderedImage) img, “JPEG”, out);
InputStream in = new ByteArrayInputStream(out.toByteArray());
// ——————————————————————————————————————————-
// AQUI COMO AGO PARA CONVERTIR LA IMAGEN A BYTE :.. PARA GUARDARLO EN BD SQL
// ——————————————————————————————————————————-
}catch(Exception ex){}ç
Deniz June 26, 2012 at 4:07 pm
Thanks a lot for this and other nice and handy tutorials.
junaid June 12, 2012 at 7:37 pm
Hello All,
I want to convert raw file to jpg.
I have file name ss.raw. I want to convert it into ss.jpg. Please help me.
Thanks in Advance.
Shark June 7, 2012 at 4:56 pm
How to read images from HDFS in map-reduce??

Bhavesh May 8, 2012 at 2:36 am

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication3;
 
        import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
 
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
 
/**
 *
 * @author Bhavesh
 */
public class JavaApplication3 {
    public static void main(String[] args) {
        // TODO code application logic here
 
 
		try {
 
			InputStream in = new ByteArrayInputStream(hexToBytes(&quot;CD302C16E7D853D5A9012AB7AD3C35310EDD55AFAE1618738C938300F43F852608A0600D2D00381C5381CD301D4B8A042814EC50025324380681922279717B9A4A620A36D9A889E6A0A400D3BAD265125ADA&quot;));
			BufferedImage bImageFromConvert = ImageIO.read(in);
 
			ImageIO.write(bImageFromConvert, &quot;jpg&quot;, new File(&quot;f:/new-darksouls.jpg&quot;));
 
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
	}
 
  public static byte[] hexToBytes(char[] hex) {
    int length = hex.length / 2;
    byte[] raw = new byte[length];
    for (int i = 0; i &lt; length; i++) {
      int high = Character.digit(hex[i * 2], 16);
      int low = Character.digit(hex[i * 2 + 1], 16);
      int value = (high &lt;&lt; 4) | low;
      if (value &gt; 127)
        value -= 256;
      raw[i] = (byte) value;
    }
    return raw;
  }
 
  public static byte[] hexToBytes(String hex) {
    return hexToBytes(hex.toCharArray());
  }
}

i got this error..

Exception in thread “main” java.lang.IllegalArgumentException: im == null!
at javax.imageio.ImageIO.write(ImageIO.java:1457)
at javax.imageio.ImageIO.write(ImageIO.java:1521)
at javaapplication3.JavaApplication3.main(JavaApplication3.java:48)
Java Result: 1

please help me

umer November 29, 2011 at 11:32 pm
hi,
how can i read image in byte array from socket and write a jpeg file, please help me here is my email umer_rock_12[at]hotmail.com
Thanks and Regards
umer

Jason November 13, 2011 at 12:33 am

Hi Mkyong,

InputStream in = new ByteArrayInputStream(rsvalue.getBytes(10));
BufferedImage bImageFromConvert = ImageIO.read(in);
 
ImageIO.write(bImageFromConvert, &quot;jpg&quot;, new File(&quot;D:\\&quot;+ rsvalue.getString(2) +&quot;.jpg&quot;));

I having this error :

Exception in thread “main” java.lang.IllegalArgumentException: im == null!

Mikhail September 12, 2011 at 10:17 pm
Thank you!
Guillermo September 7, 2011 at 5:11 am
Excelente ejemplo! Gracias.
Alexander May 26, 2011 at 4:52 am
Help me a lot, Thank you.
dilla April 7, 2011 at 4:54 pm
Great code.. much help.. thx
reza January 1, 2011 at 1:08 pm
thanks a lot
it was useful for me.
god bless you
binnu December 20, 2010 at 7:32 pm
Tu java na..mei k aaj ko hu…
aashish June 4, 2010 at 1:07 am
awesome code, helped me today…
thank you
Aashish Dalmia

How to convert byte[] to BufferedImage in Java

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