Цитата:от: Voldemar63
Доказательства на самом авторитетном в таких замерах ресурсе ДХО, там меряют без софтового влияния.
Не все так просто, у них там свои заморочки:
http://www.dxomark.com/Reviews/Detailed-computation-of-DxOMark-Sensor-normalization
[quot]
What should be remembered is that doubling the resolution adds:
...
0.5 bit to the normalized DR
...[/quot]
И что они на самом деле меряют вообще не понятно...
Dpreview, по крайней мере методику не скрывает...
[quot]Our Dynamic Range measurement system involves shooting a calibrated Stouffer Step Wedge (13 stops total range) which is backlit using a daylight balanced lamp (98 CRI). A single shot of this produces a gray scale wedge from the camera's clipped white point down to black (example below). Each step of the scale is equivalent to 1/3 EV (a third of a stop), we select one step as 'middle gray' (defined as 50% luminance) and measure outwards to define the dynamic range. Hence there are 'two sides' to our results, the amount of shadow range (below middle gray) and the amount of highlight range (above middle gray).
To most people highlight range is the first thing they think about when talking about dynamic range, that is the amount of highlight detail above middle gray the camera can capture before it clips to white. Shadow range is more complicated; in our test the line on the graph stops as soon as the luminance value drops below our defined 'black point' (about 2% luminance) or the signal-to-noise ratio drops below a predefined value (where shadow detail would be swamped by noise), whichever comes first.[/quot]
