Re: scanner profiling (again)
Re: scanner profiling (again)
- Subject: Re: scanner profiling (again)
- From: bruce fraser <email@hidden>
- Date: Wed, 17 Dec 2003 12:44:05 -0800
The brightest white that film in a camera can capture is film base +
fog. Most scanner targets have a patch that comes as close to that as
dupe slides and batch manufacturing allow.
Black point and white point are image-specific adjustments. Unless
every scene you shoot has a contrast range that's wider than film can
capture, it's unlikely that your captures will reach either the dMin
or the dMax of the film. Scanner targets generally try to come close
to the dynamic range that the emulsion can hold, within the limits of
batch-manufactured dupes, so they record the response of the scanner
to that entire dynamic range. That doesn't mean that you don't have
to set the black point and white point for each image, because they
are generally properties of the image, not of the stock on wich it
was captured.
At 2:07 PM -0600 12/17/03, Rich Apollo wrote:
So, building on what you said, Tim, would there be any merit with
maybe replacing the white patch on your target with something
reflective? A small mirror or pen light, for example, would make it
possible to establish the brightest white that the camera could
capture, wouldn't it?
--
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