ExampleJPEGCompress.cpp

Load an arbitrary format from disk and use libJpeg to convert it to JPEG-image with given (dflt 60) quality

Author

Arne Petersen

/* 
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
Multimediale Systeme der Informationsverarbeitung
Institut fuer Informatik
Christian-Albrechts-Universitaet Kiel


BIAS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

BIAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/**
   @example ExampleJPEGCompress.cpp
   @relates CompressJpeg
   @brief Load an arbitrary format from disk and use libJpeg to convert it
   to JPEG-image with given (dflt 60) quality
   @ingroup g_examples
   @author Arne Petersen
*/

//#include <Base/Common/LeakChecking.h>
#include <Base/Image/ImageBase.hh>
#include <Base/Image/ImageIO.hh>
#include <Base/Image/CompressJpeg.hh>

using namespace BIAS;
using namespace std;

int main(int argc, char *argv[])
{
  if ((argc<3)||(argc>4)) {
    cout <<"usage: "<<argv[0]<<" <in-image-file> <out-image-file>"
         " [<jpeg-quality: 0..100>]"<<endl;
    return -1;
  }
  
  BIAS::Image<unsigned char> srcImg;
  int result = ImageIO::Load(argv[1], srcImg);
  if (result!=0){
    BIASERR("Error while loading '"<<argv[1]<<"' with result="<<result);
    return result; // for Dart testing
  }
  int quality = 60;
  if (argc > 3) quality = atoi(argv[3]);
  if ((quality < 0)||(quality > 100)) {
    BIASERR("Given quality (" << quality << ") not valid!");
    return -1;
  }

  JpegHandler jHandler;
  jHandler.Init();
  int res = jHandler.Compress(srcImg, quality);
  if (res < 0) {
    BIASERR("Compression failed (returned "<< res <<")!!!");
    return -1;
  }
  string filename(argv[2]);
  if (jHandler.WriteJPEG(filename) < 0) {
    BIASERR("Error writing jpeg-image to " << argv[2] << "!!!");
    return -1;
  }

  return 0;
}