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POHow to display the greycale image in java after using setRGB?
 

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  1. POHow to display the greycale image in java after using setRGB?
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    <p>M working on some image processing program and encountered a problem of displaying the greyscale image. What i did was, i extracted the pixel values using getRGB and then tried to change these pixel values. But after changing these pixel value i'm still getting the same image which was buffered before. My part of code is given below:-</p> <pre><code> int [] rgbArray=new int[width*height]; BufferedImage buffer = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); buffer = ImageIO.read(new File(file)); //Before changing the pixel values buffer.getRGB(0, 0, width, height, rgbArray , 0,width ); int a = (0xff000000 &amp; rgbArray[0]) &gt;&gt;&gt; 24; int r = (0x00ff0000 &amp; rgbArray[0]) &gt;&gt; 16; int g = (0x0000ff00 &amp; rgbArray[0]) &gt;&gt; 8; int b = (0x000000ff &amp; rgbArray[0]); System.out.println("a " + a + " r " + r + " g " + g + " b " + b); System.out.println("rgbArray["+0+"] = "+ rgbArray[0]); for(int i = 0 ; i&lt;width*height; i++) { rgbArray[0]=0x808080; //Changing pixel values to grey } buffer.setRGB(0, 0, width, height, rgbArray , 0,width); //After changing the pixel values buffer.getRGB(0, 0, width, height, rgbArray , 0,width ); a = (0xff000000 &amp; rgbArray[0]) &gt;&gt;&gt; 24; r = (0x00ff0000 &amp; rgbArray[0]) &gt;&gt; 16; g = (0x0000ff00 &amp; rgbArray[0]) &gt;&gt; 8; b = (0x000000ff &amp; rgbArray[0]); System.out.println("a " + a + " r " + r + " g " + g + " b " + b); System.out.println("rgbArray["+0+"] = "+ rgbArray[0]); </code></pre> <p>Output for the pixel value is coming out to be correct for both original and new pixels but i'm not able to view the new image, it is showing the old i.e original image is shown not the changed image.</p>
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    1. USArizvi
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    1. COFor better help sooner, post an [SSCCE](http://sscce.org/).
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      1. POHow to display the greycale image in java after using setRGB?
      1. USAndrew Thompson
    2. COYou are allocating a large `BufferedImage` in line 2, but then throwing it away and replacing it with the call to `ImageIO.read()`. For the sake of memory, probably don't want to do that.
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      1. POHow to display the greycale image in java after using setRGB?
      1. USSean Owen
    3. COyup thax... but how can i display this changed pixel as a image??
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      1. USArizvi
 

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