title: What is the image format in the Preview Screen when Camera is enable
body: <p>What is the image format in the Preview Screen when Camera is enable?</p>
  
  <p>Is it <code>RGB?</code> Or <code>YUV?</code> Or others?</p>
  
  <p>So when I take a photo, I basically ask Andriod to convert whatever on screen from <code>YUV</code> format to <code>JPEG</code>?</p>
  
  <p>And when I record a video, Android convert that format to <code>mp4</code>?</p>