PPM file image crop bug

Hey guys im working with a program that does manipulations to simple images( in PPM format). Im trying to crops an image by a rectangle thats (x1,y1),(x2,y2). The image is 38 by 39, but I started the 2-d at [0][0]. When I crop the entire image x1=0; y1=38; x2=37; y2=0. It works fine, it just makes a cope of the original image.
Here is the code.

Code:

void graphics::crop(int x1,int y1,int x2, int y2)
{
    int i,j;

    xsize=((x2-x1)+1);   
    ysize=((y1-y2)+1); 
    
    cout<<xsize<<endl;
    cout<<ysize<<endl;
    
    for(i=0;i<xsize;i++)
    {        
        for(j=0;j<ysize;j++)
        {
            plot[i][j].red = plot[x1+i][y2+j].red;
            plot[i][j].green= plot[x1+i][y2+j].green;
            plot[i][j].blue = plot[x1+i][y2+j].blue;
        }
    }

}

after that it calls a function to load the date into a file....

Code:

void graphics::storePPM()
{
    int i,j;
    //cout<<"in store"<<endl;
    ofstream outFile;

    outFile.open("output.PPM");
    if (outFile.fail())
    {
        cout << "Unable to open output file" << endl;
    }

    outFile<<"P3"<<endl;
    outFile<<"# This file was made using graphics program by Chris Donlan"<<endl;
    outFile<<xsize<<" "<<ysize<<endl;
    
    for(i=0;i<xsize;i++)
    {        
        for(j=0;j<ysize;j++)
        {
            
                outFile<<plot[i][j].red<<endl;;
                outFile<<plot[i][j].green<<endl;
                outFile<<plot[i][j].blue<<endl;
        }
    }

    outFile<<"\r";
}

If I try to crop a smaller part of the image it becomes blured. Any ideas?

Thanks
Chris

any ideas people?

> If I try to crop a smaller part of the image it becomes blured. Any ideas?
Check the raw data of the cropped image - use a debugger.
At least one graphics viewer I know of starts interpolating images (that's fuzzy-making to you) when you zoom in too much.