Digital BW, The Print

A couple more basic questions and sorry if this is fundamental ³colour
theory².  What about the K in your CMYK readings? I still struggle to think
in RGB, let alone CMYK.  R=G=B=x gives me a dead neutral shade of grey,
correct?  What would be warm/cool in RGB terms?

Roy and Carl:  I was wondering if it made sense to incorporate some of the
math posted by Carl into, say,  Run-Calc-Density so that you can get a sense
of measured rather than eyeballed warmth/coolness/neutrality of a curve or
curve combination.  Perhaps the calculations are too difficult ­ it is
certainly way beyond my understanding for now.

Getting there slowly...

Steve


From: "Paul Roark" <paul.roark@...>
Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
Date: Sat, 24 Jan 2004 12:36:36 -0800
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Subject: RE: [Digital BW] Glossy printing with Eboni -- who needs a 4000?



>When you say something is 14 units warm what measurement scale
>are you using?  

I use the difference between the cyan and yellow spectrophotometer readings
as a simplified measure of relative warmth or coolness.  If, for example, Y
is 0.60 and C is 0.55, I'd call the print warm by 5 units.  This would be a
typical medium warm, midtone reading.

The neutral I aim for is a 50% reading of C = 0.61, M = 0.62, Y = 0,61.
Since C = Y, it would be "neutral."  The magenta being one unit (one
one-hundredth [0.01] actually) above C & Y is what gives the "selenium"
look.

Since I the variable-tone inksets, in effect, pull the print along a
one-dimensional axis, the one unit relative measure (difference between cyan
and yellow) acts as a good, simplified way to compare tones or hues.

I hope this helps clarify my short hand.

Paul
www.PaulRoark.com 



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