Added sample code for tutorial - cpp

samples/cpp/tutorial_code/Basic/LoadSaveImage.cpp

@@ -0,0 +1,52 @@
+/**
+ * @file LoadSaveImage.cpp
+ * @brief Sample code that load an image, modify it and save the new image.  
+ * @author OpenCV team
+ */
+
+#include <cv.h>
+#include <highgui.h>
+
+using namespace cv;
+
+/**
+ * @function main
+ * @brief Self-explanatory
+ */
+int main( int argc, char** argv )
+{
+  /// Get the name of the file to be loaded
+  char* imageName = argv[1];
+
+  /// Create a Mat object
+  Mat image;
+  
+  /// Load the image using imread
+  image = imread( imageName, 1 );
+  
+  /// Verify that the image was loaded
+  if( argc != 2 || !image.data )
+    {
+      printf( " No image data \n " );
+      return -1;
+    }
+
+  /// Change the image to Grayscale
+  Mat gray_image;
+  cvtColor( image, gray_image, CV_RGB2GRAY );
+
+  /// Save our gray image
+  imwrite( "../../images/Gray_Image.png", gray_image );
+
+  /// Create a couple of windows and show our images
+  namedWindow( imageName, CV_WINDOW_AUTOSIZE );
+  namedWindow( "Gray image", CV_WINDOW_AUTOSIZE );
+
+  imshow( imageName, image );
+  imshow( "Gray image", gray_image ); 
+
+  /// Wait until user finish the application   
+  waitKey(0);
+
+  return 0;
+}