Re: Dynamic Range testing
Re: Dynamic Range testing
- Subject: Re: Dynamic Range testing
- From: Jim Rich <email@hidden>
- Date: Thu, 06 May 2004 16:31:54 -0400
On 5/6/04 3:39 PM, "Rudy Harvey" <email@hidden> wrote:
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Hi Terry, It was called the Q' Factor.
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You are correct , it is a very real effect, caused by dispersion of the
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light path
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by film grain. It is another good reason to scan using oil. Using oil
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in effect , reduces
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the number of surfaces to 2 instead of 6(mylar-2 , film-2,drum-2)
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Yea, have not heard that mentioned in over 10 years.
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I just love terms like this , they only mean something to about 20
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people on the planet.
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All the Best
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Rudy Harvey
Rudy,
Since you like those terms, perhaps some on this list might find this
spectrophotmetric tid bit interesting. In the early 1900s (1909) a chap
named Callier created a formula for the relationship between specular
density and diffuse density. The formula is called Calliers Q factor.
Jim Rich
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