D200 vs D70 Dynamic Range graph

Started Jan 30, 2006 | Discussions thread
Bill Janes Senior Member • Posts: 1,848
Re: Comment and question

Jim Kaye wrote:

Your summary log-log plot seems to indicate that ACR produces
higher pixel values in the darker areas of a raw image than NC
does. To my eye, ACR at default settings produces images with
better detail in shadow areas than NC (assuming low ISO and
therefore low noise levels), which seems consistent with the data

Is that a correct interpretation of the information you have

(I know this is only indirectly related to the question of DR.)
Jim Kaye

'I believe that the electronic image will be the next major
advance. Such systems will have their own inherent and inescapable
structural characteristics, and the artist and functional
practitioner will again strive to comprehend and control them.' --
Ansel Adams, 1981


Yes, I think that your intrepretation is correct. The default curve of Nikon Capture rolls off the shadow tones faster than ACR. For those making prints, what does this mean? A good print has a contrast ratio of 100:1 or 6.6 stops. If you lower the contrast so the entire range can be printed, the midtones will be flat. You can apply an S curve to roll off the highlights and shadows or simply lopp of the shadows if they contain little detail and much noise. I can't really say that one converter produces better results than the other in high contrast situations.

BTW, a great quote from Adams.
Bill Janes

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