printpgm.h

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#include <fstream>
#include <iostream>
#include <sstream>
#ifndef _WIN32
  #include <unistd.h>
#endif
 
 
using namespace std;
ostream& printpgm(ostream& os, int xsize, int ysize, const double * const * matrix){
        if (!os)
                return os;
        os<< "P5" << endl <<  xsize << endl << ysize << endl << 255 << endl;
        for (int y=ysize-1; y>=0; y--){
                for (int x=0;x<xsize; x++){
                        unsigned char c=(unsigned char)(255*fabs(1.-matrix[x][y]));
                        os.put(c);
                }
        }
        return os;
}