public void blurImage(int radius){
        for (int i=0;i<rows;i++){
            for(int j=0;j<cols;j++){
                blurPixel(i, j, radius);
            }
        }
    }



    private RGBColor blurPixel(int row,int col, int radius){
        int sumRed=0, sumGreen=0 ,sumBlue=0;
        int averageRange = (2*radius+1)*(2*radius+1);
        for (int i=row-radius;i<row+radius;i++){
            for (int j=col-radius;j<col+radius;j++){
                if (!insideImage(i, j)){
                    image[i][j]= new RGBColor();
                }
                sumRed += image[i][j].getRed();
                sumGreen+= image[i][j].getGreen();
                sumBlue+= image[i][j].getBlue();
            }
        }
        int blurRed=sumRed/averageRange;
        int blurGreen=sumGreen/averageRange;
        int blurBlue=sumBlue/averageRange;

         return image[row][col] = new RGBColor(blurRed, blurGreen, blurBlue);

    }