卷積模糊濾鏡不起作用並使圖像變亮

我最近閱讀過卷積濾鏡，並決定嘗試一下。我想製作模糊圖像的代碼，但最終它做的是讓它變亮。我一直在看我的代碼一段時間，並且找不到任何錯誤。誰能幫忙？卷積模糊濾鏡不起作用並使圖像變亮

這裏是我的代碼：

final static int filterHeight =3; 
final static int filterWidth = 3; 
static double filter[][] = new double[][]{ 
    {1,1,1}, 
    {1,1,1}, 
    {1,1,1}  
    }; 

public static void main(String[] args) { 
    BufferedImage img; 
    BufferedImage result; 
    try 
    { File in = new File("in.jpg"); 
     File out = new File("out.jpg"); 
     img = ImageIO.read(in);   
     Color[][] pixels = new Color[img.getWidth()][img.getHeight()];   
     for(int i=0;i<img.getWidth();i++){ 
      for(int j=0;j<img.getHeight();j++){ 
       pixels[i][j]=new Color(img.getRGB(i,j),true); 
      } 
     } 
     result = new BufferedImage(img.getWidth(), img.getHeight(), img.getType()); 
     for(int x=0;x<img.getWidth();x++){ 
      for(int y=0;y<img.getHeight();y++){      
       int r=0,g=0,b=0;      
       for(int i=0;i<filterWidth;i++){ 
        for(int j=0;j<filterHeight;j++){ 
         int imageX = (int)(x - filterWidth/2 + i + img.getWidth()) % img.getWidth(); 
          int imageY = (int)(y - filterHeight/2 + j + img.getHeight()) % img.getHeight(); 
          if(imageX<0 || imageY<0) System.out.println("ERROR: "+imageX+" "+imageY); 
          r+=pixels[imageX][imageY].getRed()*filter[i][j];        
          g+=pixels[imageX][imageY].getGreen()*filter[i][j];        
          b+=pixels[imageX][imageY].getBlue()*filter[i][j];       
        } 

        if(r>255) r=255; 
        if(r<0) r=0; 
        if(g>255) g=255; 
        if(g<0) g=0; 
        if(b>255) b=255; 
        if(b<0) b=0; 
        Color color = new Color(img.getRGB(x,y),true) 
        Color colorBlur = new Color(r,g,b,color.getAlpha()); 
        result.setRGB(x, y, colorBlur.getRGB()); 
       } 
      } 
     } 


     ImageIO.write(result, "JPG", out); 
    } 
    catch (IOException e) 
    { 
     e.printStackTrace(); 
    }

這裏是aplying過濾器之前的圖像：而經過：