title: Rendering on a 48 bit rgb image using OpenGl
body: <p>I have a 16 bit gray scale image with me and I want to draw annotations on top of that.
  Initially i started with Direct 2d and later I realized that it is not possible to render 16 bit/channel in direct 2d</p>
  
  <p>Later i moved to Open Gl and now I am not able to conclude that will Open gl support rendering in 16 bit/channel image.I have studied about frame buffer object.and also about mesa3d library</p>