Re: Dynamic Range testing
Re: Dynamic Range testing
- Subject: Re: Dynamic Range testing
- From: "Terence L. Wyse" <email@hidden>
- Date: Wed, 5 May 2004 11:15:37 -0400
On May 4, 2004, at 11:09 PM, Roger Breton wrote:
Why not scan a Stouffer Certified 21 Step Transparent Calibration
target
T2120CC? It's piece of black and white film that goes from .04d to
4.07d.
That would definitely be less expensive than the Kodak ST-34 that Jim
Rich and I suggested (I mistakenly called it the T-34 step wedge).
However, the Stouffer scale is a silver-based step wedge instead of
being of the dye/carbon variety. I'm reaching back almost twenty years
(oh, hey, I wondered where I put that...) but I thought the issue with
silver scales was that they would APPEAR more dense to the scanner as a
result of the light getting blocked by the relatively large silver
grains as opposed to being nicely diffused by the carbon dye material
in the more expensive step wedges. I forget the term for this effect
but it was "real" and the reason why you couldn't use a plate exposure
step wedge on a scanner. The silver scales worked fine when used in
contact (such as plates) but not so well when light was projected
through them. Just a thought.
Terry
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