spliting of an image using java

Question

Actually I am splitting a 600x700 .jpg file using JAVA . Here the method's parameter width and height exactly same as images width and height. But during execution I got an exception related to heap memory.

 /*
 * this method will split the secureImage file
 */
private BufferedImage[] getsecureFragments(int width, int height,
        File secureFile)throws IOException {

    FileInputStream secureFileStream = new FileInputStream(secureFile);  
    BufferedImage secureimage = ImageIO.read(secureFileStream);
    int rows    = width;
    int columns = height;
    int chunks = rows *columns;
    int chunkWidth = width/width;
    int chunkHeight=height/height;

    int count = 0;  
    BufferedImage fragmentImgs[] = new BufferedImage[chunks];
    System.out.println(fragmentImgs.length);
    for (int x = 0; x < rows; x++) {  
        for (int y = 0; y < columns; y++) {  
            //Initialize the image array with image chunks  
            fragmentImgs[count] = new BufferedImage(chunkWidth, chunkHeight, secureimage.getType());  

            // draws the image chunk  
            Graphics2D grSecure = fragmentImgs[count++].createGraphics();  
            grSecure.drawImage(secureimage, 0, 0, chunkWidth, chunkHeight, chunkWidth * y, chunkHeight * x, chunkWidth * y + chunkWidth, chunkHeight * x + chunkHeight, null);  
            grSecure.dispose();  
        }  
    } 

    System.out.println("Splitting done");  

    //writing mini images into image files for test purpose  
    for (int i = 0; i < fragmentImgs.length; i++) {  
        ImageIO.write(fragmentImgs[i], "jpg", new File("F://uploads//fragmentImgs" + i + ".jpg"));  
    }  
    System.out.println("Mini images created");
    return fragmentImgs;
}//end of method getsecureFragments

Exception in thread "http-bio-8080-exec-9" java.lang.OutOfMemoryError: Java heap space

This is because of my logical lack? or Do i have to learn more about JAVA heap memory.

You have 420 *thousand* images held open in memory at the same time... I'm not surprised it runs out of memory. Also, take a look at [`BufferedImage.getSubimage`](https://docs.oracle.com/javase/8/docs/api/java/awt/image/BufferedImage.html#getSubimage-int-int-int-int-) -- maybe useful. — Boann, Nov 17 '15 at 20:47

score 0 · Accepted Answer · answered Nov 13 '15 at 05:42

You can run the JVM with more heap space e.g. add a -Xmx argument when you start the JVM.

You could also rewrite the code to copy a section, write it to disk, discard it, and then do the next section. At the moment, the logic in the program produces all of the sections, and then saves them.

spliting of an image using java

1 Answers1