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Subject: Re: raw 3.1 professional custom profiles for highend digital cameras

Bruce Fraser wrote:

"Of course, 12, 12.5, or 13% reflectance is even further down the linear tone scale than 18%, which makes it an even worse aim point for metering the highlights—in 8-bit terms it's around level 37 instead of level 50...."

A good point Bruce, but as another poster pointed out, a meter (at least the older ones such as the Pentax 1 degree digital) simply give you a number related to the target luminance and independent from the calibration point of the meter. You can do what you want with that number.

In my 1981 printing of "The Negative" Ansel Adams shows a picture of his Pentax meter on which he placed his own calibration scale (page 63). Of course with a null meter such as the Gossen Luna Pro or the meters built into most dSLR's you have to apply an offset to the indicated reading.

While I have that book out, I would like to share this quote from the introduction: "I eagerly await new concepts and processes. 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, March 1981


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