#include <stdio.h>
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
#pragma comment(lib,"cv.lib")
#pragma comment(lib,"cxcore.lib")
#pragma comment(lib,"highgui.lib")

void nega(unsigned char *out, unsigned char *in, int inHeight, int inWidth, int inChannel);

int main(){
   IplImage *in, *out;
   int i,j;

   in = cvLoadImage("./image640.bmp", 0);
   out = cvCreateImage(cvSize(in->width, in->height), in->depth, in->nChannels);

   nega((unsigned char*)out->imageData, (unsigned char*)in->imageData, in->height, in->width, in->nChannels);

   cvNamedWindow("in", 1);
   cvShowImage("in", in);
   cvNamedWindow("out", 1);
   cvShowImage("out", out);
   cvWaitKey(-1);

   cvDestroyWindow("in");
   cvDestroyWindow("out");

   cvReleaseImage( &in );
   cvReleaseImage( &out );


   return 0;
}


void nega(unsigned char *out, unsigned char *in, int inHeight, int inWidth, int inChannel){
   int i, j;
   int index;
   int widthStep;

   widthStep = inWidth * inChannel;
   if(widthStep % 4 != 0){
      widthStep = widthStep + 4- widthStep%4;
   }

   for(i = 0; i < inHeight; ++i){
      for(j = 0; j < inWidth; ++j){
          index = i * widthStep + j;
         // ƒlƒKƒ|ƒW”½“]
         out[index] = 255 - in[index];
      }
   }
}