Inversion of image pixel values

Image inversion: Gray image range is [0,l-1] image inversion, expression s=l-1-r; reverse the intensity of the image in this way, it can produce the image inversion of the equivalent image.

# include <stdlib.h> #include <stdio.h> #include <math.h> #include "cv.h" #include "highgui.h" #pragma Comment (lib, "Cv.lib")  #pragma comment (lib, "Cxcore.lib")  #pragma comment (lib, "Highgui.lib") int main () {  int length,width,step,channel;  UCHAR * data;  int i,j,k;  iplimage* img;  Img=cvloadimage ("1.jpg", 0);  Cvnamedwindow ("source", 0);  Cvshowimage ("Source", IMG);  if (!img)  printf ("Could not find the image\n");  length=img->height;  width=img->width;  step=img->widthstep;  channel=img->nchannels;    Data= (uchar*) img->imagedata;  for (i=0;i<=length-1;i++) {for (j=0;j<=width-1;j++) {for  (k=0;k<=channel-1;k++)  {   data[i* STEP+J*CHANNEL+K]=255-DATA[I*STEP+J*CHANNEL+K];  } }}  Cvnamedwindow ("Convert", 0);  Cvshowimage ("Convert", IMG);  Cvwaitkey (0);  Cvreleaseimage (&img);  return 0;}

Inversion of image pixel values