Digital BW, The Print

Thanks.  I was jumping straight to the density equation from the Y values
from the Measure Tool without realising they need to be divided by 100


From: "Paul D. DeRocco" <pderocco@...>
Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
Date: Mon, 22 Dec 2003 12:49:16 -0800
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Subject: RE: [Digital BW] Calculating density values with Eye-One

> From: Steve Kale [mailto:stevekale@btinternet.com]
>
> So density is always a negative number?  I thought we talked about density
> figures as positive numbers eg a dMax of 1.64.  In Roy¹s
> calibration doc he
> has numbers like 127, 121, 131....  (I am taking the middle
> number from the
> Sample spot measurement in the XYZ space using Measure Tool¹s Spot
> Measurement function ie a dark black is producing a y value of around 2.0)

No, L values go up to 100, for 100% reflectivity or transmissivity. If you
poke in L values that are less than 100, the log will be negative, so
negating it gives you a positive value.

      D      L
      0      100
      1      38
      2      9
      3      0.9
      4      0.09

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@...



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