Digital BW, The Print

Hi Roy & thanks for the info.
Measuring the Dmin/Dmax makes sense to me, and dividing it by the 
number of steps I am measuring makes sense to me, AND I have a vague 
recollection of what a logarithm is, BUT, when I was young & smart 
it surely would have made total sense to me.  Now I am old & stupid 
& just a photographer, and really don't remember how/what to do with 
logarithm.  I "seem" to remember that a logarithm is "based" on 
another number, say base 10, or something.
Anyway, if you don't mind, could you expand on what you mean by 
logarithmic, and help out an aging feeble minded photographer 
<smiling>.
Lastly though, even with your help, and when I can figure this out 
and get my numbers, I still can not figure out how to input 
the "AIMS" into IJC.  At the moment all my "AIMS are 0.00. The 
sample profiles they provide have other numbers (presumably along 
the lines of what I am looking for), but I can not figure how/where 
within the program these "AIMS" are inputed.
Cheers Roy,
Kevin Logan

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roy 
Harrington" <roy@h...> wrote:
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "klog52756" 
<klog52756@y...> 
> wrote:
> > Hi,
> > 2 questions:
> > 1. How are the IJC "AIMS" determined for any particular 
inkset/paper
> > 2. How are the "AIMS" inputed into the program so that they 
appear?
> > Thanks
> > Kevin Logan
> 
> Hi Kevin,
> 
> The AIMS are based on measured values of dMin (the plain paper) 
and dMax
> (paper with the max amount of ink).  You just evenly divide the 
range into
> the number of steps you want.  The tricky thing is that density is 
a 
> logarithmic scale.  If you were to look at it in L* space (from 
LAB) it would
> be mathematically linear and also linear in human perception.
> 
> Roy
> www.harrington.com