On 11/7/2010 2:58 PM, Tim Øsleby wrote:
I believe that more headroom in the dark areas is in the nature of the
sensor wells.
When a cup is full, you can't pour more water into it. If you try to,
you pours over. I think it is almost as simple as that.
In the dark areas, on the other hand, the information will be obscured
by noise, but it the information is present. In other words, you can
recover more information there.
Higher dynamic range gives us opportunity to expose more
conservatively without loosing information. I think this is what gives
us more headroom in practical use.
But as suggested; I'm just a bloke who speculates on this topic.
Others may have mush better answers.
What you say, Tim, makes perfect sense. But outside of Pentaxia, there
are cameras and sensors that have more headroom in the bright areas. Or
at least so it is said. I'd like to see some measurements in that
regard, or better yet reports of actual experience when exposure had to
be corrected in post so as to recover bright areas...
Boris
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