----- Original Message ----- From: "Shel Belinkoff"
Subject: Re: Film vs. Digital - A necessary test
The lab I use has tweaked their system to allow for finer gradations
between settings, or so I've been told by the Photoshop guy (not the
printer guy). I can't explain it better because I don't know all the
technical terms, but apparently there are buttons on the machine that allow
for a certain degree of separation between color and exposure adjustments,
and this lab has halved the difference between the steps.
We have some gross corrections available, called "button corrections"
This is used to control colour correction (more yellow, less yellow, etc...), and density correction.
The button is expressed as a % of colour change, I'm not sure where mine are right now, probably 4% for colour, and 6% for density.
These amounts of expression are user adjustable.
Smaller expressions means finer control over the correction, but compromises the maximum degree of correction that can be applied.
One can also get off the keyboard and into Menuville.
In Menuville, I can control shadow, normal and highlight contrast, as well as overall contrast, I can add or subtract the degree of sharpening given, and also chroma levels, though not over individual colours, unfortunately.
These controls have a very fine expression, 1% units.
However, if I take a left turn at Set-Up avenue, just towards the end of Menuville Drive, I get into the suburbs, and find Parameter Boulevard.
Here, I can fine tune how the exposure slope of each colour for paper and DX code, and also bias how digital inputs are treated, also with 1% expressions.
William Robb
