使用FileInputStream和FileOutputStream实现图片反色

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;



public class HomeWork {

	public static void main(String[]args) throws IOException{
		String filename="src/changeColor.bmp";
		DataInputStream in=new DataInputStream(
				new BufferedInputStream(
						new FileInputStream(filename)));
	
		String filename1="src/changeColor1.bmp";
		
			FileOutputStream fos=new FileOutputStream(filename1);
		
		int b=0;
		byte[] buf=new byte[54];
	    in.read(buf);
	    fos.write(buf);
	    //in.skip(54);
		while((b=in.read())!=-1){
			fos.write(255-b);
		}
		fos.close();
		in.close();
	}
}