In digital photography, exposing to the right is the technique of deliberately slightly over-exposing an image to get the best results out of the digital image sensor.
The solution to both the issue of the reduced number of shades of color and the SNR degradation is to maximize the exposure (also known as exposing to the right).
This is the logic behind the philosophy of 'exposing to the right' of the histogram when shooting in RAW. However, some care needs to be exercised in this approach to avoid completely blowing out your highlights.
This brings us to the concept of Exposing To The Right (ETTR), that is, exposing for highlights and developing for the highlights.
This technique is called exposing to the right, and works here because the brightness range of the subject was well within the dynamic range of the camera's sensor (note that exposing to the right only works if you shoot in RAW).
Adobe, in its tutorials on Camera Raw, suggests 'exposing to the right' in order to maximize the midtones and shadow information recorded by the camera.
Increasing exposure post-capture will also amplify any noise in the shadows, something best avoided. This technique is commonly referred to as "exposing to the right" and can work on all types of images, ...
 See also: Digital, Film, Image, Light, Shooting
  
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