opcv code3

Maxing out (saturating) only the S and V parts of an HSV image
int main()
{
  IplImage* img = cvLoadImage( "C:\\ENEL\\OpenCV2.1\\samples\\c\\airplane.jpg" );
 for( int y=0; y<img->height; y++ ) {
    uchar* ptr = (uchar*) (
      img->imageData + y * img->widthStep
    );
    for( int x=0; x<img->width; x++ ) {
      ptr[3*x+1] = 255;
      ptr[3*x+2] = 255;
    }
  }
    cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
    cvShowImage( "Example1", img );
    cvWaitKey(0);
cvReleaseImage( &img );
}
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#include <cv.h>
#include <stdafx.h>
#include <highgui.h>
void my_mouse_callback(
   int event, int x, int y, int flags, void* param
);
CvRect box;
bool drawing_box = false;
void draw_box( IplImage* img, CvRect rect ) {
  cvRectangle (
    img,
    cvPoint(box.x,box.y),
    cvPoint(box.x+box.width,box.y+box.height),
    cvScalar(0xff,0x00,0x00)    /* red */
  );
}
int main( int argc, char* argv[] ) {
  box = cvRect(-1,-1,0,0);
  IplImage* image = cvCreateImage(
    cvSize(200,200),
    IPL_DEPTH_8U,
    3
  );
  //cvZero( image );
  IplImage* temp = cvCloneImage( image );
  cvNamedWindow( "Box Example" );
  cvSetMouseCallback(
    "Box Example",
    my_mouse_callback,
    (void*) image//change to temp will earse square after drawing
  );
  while( 1 ) { //drawing process on temp, but drawn on image
    cvCopy( image, temp );
    if( drawing_box ) draw_box( temp, box );
    cvShowImage( "Box Example", temp );
    if( cvWaitKey( 15 )==27 ) break;
  }
 
  cvReleaseImage( &image );
  cvReleaseImage( &temp );
  cvDestroyWindow( "Box Example" );
}
void my_mouse_callback(
   int event, int x, int y, int flags, void* param
) {
  IplImage* image = (IplImage*) param;
  switch( event ) {
    case CV_EVENT_MOUSEMOVE: {
      if( drawing_box ) {
        box.width  = x-box.x;
        box.height = y-box.y;
      }
    }
    break;
    case CV_EVENT_LBUTTONDOWN: {
      drawing_box = true;
      box = cvRect(x, y, 0, 0);
    }
    break;
    case CV_EVENT_LBUTTONUP: {
      drawing_box = false;
      if(box.width<0) {
        box.x+=box.width;
        box.width *=-1;
      }
      if(box.height<0) {
        box.y+=box.height;
        box.height*=-1;
      }
      draw_box(image, box);
    }
    break;
  }
}

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