#include "cv.h"
#include "highgui.h"
#include <stdio.h>

int main ()
{
// new IplImage structure 'img', using 8-bit unsigned integer representation
// over 3 channels. This constructs a colour image with blue, green and red
// channels (in that order) with each colour value being an 8-bit unsigned
// integer (0-255).
  IplImage *img = cvCreateImage(cvSize(100, 100), IPL_DEPTH_8U, 3);

// fill every third channel (all the red ones) with value 255.
  int i;
  for (i = 2; i < img->imageSize; i+=3)
    img->imageData[i] = 255;

// a visualization window is created with title 'image'
  cvNamedWindow ("image", 1);

// img is shown in 'image' window
  cvShowImage ("image", img);

// wait for infinite delay for a keypress
  cvWaitKey (0);

// memory release for img before exiting the application
  cvReleaseImage (&img);

// Self-explanatory
  cvDestroyWindow("image");

  return (0);
}