Bitmap conversion

I was searching the 'net for 24 bit to 16 bit bitmap conversion code.
I found this and modified it so that it should output the bitmap to a new file after conversion, but it doesn't work. Can anyone help me?
here is the code

Code:

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#include <iostream>
#include <fstream>
#include <windows.h>

using namespace std;
// Macros
struct BITMAPINFOHEADER1
{
  DWORD biSize;      // number of bytes in this structure
  LONG  biWidth;    // width of the bitmap
  LONG  biHeight;    // height of the bitmap
  WORD  biPlanes;    // number of planes (don't worry about it)
  WORD  biBitCount;  // bits per pixel (1,4,8,16,24 or 32)
  WORD  biCompression;  // type of compression
  DWORD biSizeImage;    // size of image in Bytes
  LONG  biXPelsPerMeter; // x res of target display
  LONG  biYPelsPerMeter; // y res of target display
  DWORD biClrUsed;      // how many colors are used
  DWORD biClrImportant;  // number of important colors
};

#define RGB16(red, green, blue) ( ((red >> 3) << 11) | ((green >> 2) << 5) | (blue >> 3))

void LoadBitmap()
{
  BITMAPINFOHEADER1 infoheader;
  WORD            *bitmapData;
  WORD            *bitmapDone;
  FILE            *bitmapFile;

  BYTE            red, green, blue;

  bitmapFile = fopen("Grass.bmp", "rb");
  fseek(bitmapFile, sizeof(BITMAPFILEHEADER), SEEK_SET);
  fread(&infoheader, sizeof(BITMAPINFOHEADER1), 1, bitmapFile);

  bitmapData = new WORD[infoheader.biWidth * infoheader.biHeight];
  bitmapDone = new WORD[infoheader.biWidth * infoheader.biHeight];


  for( int y=0; y<infoheader.biHeight; ++y)
  {
      for( int x=0; x<infoheader.biWidth; ++x)
      {
        fread(&blue, sizeof(BYTE), 1, bitmapFile);
        fread(&green, sizeof(BYTE), 1, bitmapFile);
        fread(&red, sizeof(BYTE), 1, bitmapFile);

        bitmapData[y*infoheader.biWidth + x] = RGB16(red, green, blue);
      }
  }
 
  int heightIndex = 0;
  for( y=infoheader.biHeight-1;  y>=0; --y)
  {
      for( int x=0; x<infoheader.biWidth; ++x)
        bitmapDone[heightIndex*infoheader.biWidth + x] = bitmapData[y*infoheader.biWidth + x];

      ++heightIndex;
  }
  ofstream out;
  out.open("Grass2.bmp");
  int Index=0;
  while (Index < infoheader.biSizeImage)
  {
          out << bitmapDone[Index];
          Index++;
  }
  out.close();
}

int main()
{
        LoadBitmap();
        return 0;
}

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> out.open("Grass2.bmp");
Use binary mode to open the file.

Code:

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  out.open("Grass2.bmp", ios::binary);

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> out << bitmapDone[Index];
And use write() to write binary data.

Code:

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          out.write( reinterpret_cast<const char *>(&bitmapDone[Index]), sizeof(bitmapDone[index] );

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Or alternately you can probably write the whole array without a loop with something like:

Code:

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out.write( reinterpret_cast<const char *>(&bitmapDone), infoheader.biSizeImage * sizeof(bitmapDone[0] );

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