title: How to use JavaCv's cvSaveImage in android
body: <p>I have created an app using javaCv and 
  I'm trying to save an image in android using </p>
  
  <pre><code>cvSaveImage("/storage/sdcard0/watermarked/test.jpg", yCrCb);
  cvSaveImage("/storage/extSdCard/test.jpg",yCrCb);
  </code></pre>
  
  <p>where yCrCb is an IplImage. </p>
  
  <p>There is no exception error and the program runs smoothly but the files are not saved into the path as mentioned above.
  I would like to ask what might be the possible problems ? is it the naming convention of the file name ? </p>
  
  <p>If it helps, I have a java application counterpart of this app and the java version works fine when i use the line </p>
  
  <pre><code>cvSaveImage("C:\\testing123.jpg", yCrCb);
  </code></pre>