double-brightness.cpp

// double-brightness.cpp
#include <iostream>
#include <fstream>
#include "GrayLevelImage2D.hpp"
 
using namespace std;
 
int main( int argc, char** argv )
{
  typedef GrayLevelImage2D::GrayLevel GrayLevel;
  typedef GrayLevelImage2D::Iterator  Iterator;
  if ( argc < 3 ) 
    { 
      std::cerr << "Usage: double-brightness <input.pgm> <output.pgm>" << std::endl;
      return 0;
    }
  GrayLevelImage2D img;
  ifstream input( argv[1] ); // récupère le 1er argument.
  bool ok = img.importPGM( input );
  if ( !ok )
    {
      std::cerr << "Error reading input file." << std::endl;
       return 1;
    }
  input.close();
  for ( Iterator it = img.begin(), itE = img.end(); it != itE; ++it )
    {
      *it = ( 2 * (int)(*it) ) % 256;
    }
  ofstream output( argv[2] ); // récupère le 2ème argument.
  ok = img.exportPGM( output, false );
  if ( !ok )
    {
      std::cerr << "Error writing output file." << std::endl;
       return 1;
    }
  output.close();
  return 0;
}