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From: markspace <-@.>
Newsgroups: comp.lang.java.programmer
Subject: Re: ImageIO/BufferedImage behaving inconsistently from one day to the next.
Date: Tue, 19 Jun 2012 20:22:47 -0700
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On 6/19/2012 7:31 PM, Fred Greer wrote:
> I have code that used to work perfectly, which processes images in
> certain ways, and today it suddenly was not working. I hadn't changed the
> code at all. I tracked the problem down to spurious
> IllegalArgumentExceptions being thrown by this code:
>
> public class ImageUtils {
>
>      private static float[] BLUR = {0.1111111, 0.1111111, 0.1111111,
>                                     0.1111111, 0.1111111, 0.1111111,
>                                     0.1111111, 0.1111111, 0.1111111}
> ...
>      public static BufferedImage blur (BufferedImage img) {
>          Kernel k = new Kernel(3, 3, BLUR);
>          ConvolveOp co = new ConvolveOp(k, ConvolveOp.EDGE_NO_OP, null);
>          BufferedImage dest = new BufferedImage(img.getWidth(),
>              img.getHeight(),img.getType());
>          co.filter(img,dest);
>          return dest;
>      }
> ...
> }


So this is the code you say isn't working?  It works for me:


package quicktest;

import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import javax.imageio.ImageIO;

/**
  *
  * @author Brenden
  */
public class ConvlPng {

    public static void main(String[] args)
          throws Exception
    {
       BufferedImage png = ImageIO.read( 
ConvlPng.class.getResourceAsStream( "conv_test.png" ) );
       BufferedImage conv = blur( png );
       System.out.println( conv );
    }


     private static float[] BLUR = {0.1111111f, 0.1111111f, 0.1111111f,
                                    0.1111111f, 0.1111111f, 0.1111111f,
                                    0.1111111f, 0.1111111f, 0.1111111f};

     public static BufferedImage blur (BufferedImage img) {
         Kernel k = new Kernel(3, 3, BLUR);
         ConvolveOp co = new ConvolveOp(k, ConvolveOp.EDGE_NO_OP, null);
         BufferedImage dest = new BufferedImage(img.getWidth(),
             img.getHeight(),img.getType());
         co.filter(img,dest);
         return dest;
     }
}