First I have made the software and afterwards I am going to make the cnc!
Steps to use:
1.Drag or resize the application window so that inner retangle show the image you want to capture
2. Click the "Capture Screen" button
3. Click the "Do Outline" button
And you are done, the output will have the outline of the selected image from the inner rectangle.
*Note that the outline is made only for black (or gray) objects.