Q006: How much can I overexpose a raw file without
any harm for the result?
A: Camera models vary in the tradeoff they make between highlight
headroom and shadow noise. Some leave a significant amount of highlight
headroom during a normal exposure. This allows significant negative
compensation to be applied during raw conversion, but also means normal
exposures will contain more shadow noise. Other models leave less headroom
during normal exposures. This allows for less negative exposure compensation,
but results in lower shadow noise for normal exposures.
We advise to be careful with any overexposusre. But if you know your
camera and histogram you can improve the noise in your image by using