Re: Dynamic Range testing
Re: Dynamic Range testing
- Subject: Re: Dynamic Range testing
- From: Ernst Dinkla <email@hidden>
- Date: Fri, 07 May 2004 11:21:40 +0200
Jim Rich wrote:
On 5/6/04 3:39 PM, "Rudy Harvey" <email@hidden> wrote:
Hi Terry, It was called the Q' Factor.
You are correct , it is a very real effect, caused by dispersion of the
light path
by film grain. It is another good reason to scan using oil. Using oil
in effect , reduces
the number of surfaces to 2 instead of 6(mylar-2 , film-2,drum-2)
Yea, have not heard that mentioned in over 10 years.
I just love terms like this , they only mean something to about 20
people on the planet.
All the Best
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
The Callier effect as we called it in relation to the behaviour
of silver emulsions in point light enlargers versus diffuse light
enlargers. There still could be a good reason to use a silver
target in a scanner if it will be used for non-chromogene B&W
film. The use of oil will not reduce the true Callier effect but
can reduce a related effect of a matte film surface.
Ernst
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