Digital BW, The Print

Carl and Steve: 

This is exactly the problem I mentioned in an earlier post about 
profiling the Arches Smooth paper.  The Lab values were linear up to 
a 90% gray.  After that (for the 92, 94, 96, 98 and 100% gray) LAB 
values read: 19.39, 19.06, 18.70, 18.95, 19.39.  Rather than 
correcting this nonlinearity, Create ICC produced an unusable profile 
with a full scale, retangular spike between LAB 0 and LAB 8 (e.g. LAB 
5 was "corrected" to LAB 98).  So this supports Carl's description of 
function (and, I think, reduces the utility of the program).

The abnormailty in this case was produced, I think, by the way the 
ink sits on the Arches coating: way too wet.

Walt

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl Schofield 
<scho@m...> wrote:
>
> Steve,
> 
> Yes, I tried it and it works well.  It assumes you have values from 
0  
> to 100 and just scales accordingly (after sorting).  There is a  
> potential for error if your D values (or inversely L values) to 
not  
> increase with increasing gray values, but that would be abnormal.
> 
> Carl
> 
> On Oct 18, 2005, at 9:34 AM, Steve Kale wrote:
> 
> > Actually Carl are you sure about this?  It should also need the  
> > Gray value
> > else it does not know for what input the output was generated.
> >
> >
> >
> >> From: Carl Schofield <scho@m...>
> >> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> >> Date: Tue, 18 Oct 2005 08:45:08 -0400
> >> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> >> Subject: Re: [Digital BW] ICC v. Transfer Function in Epson 
driver
> >>
> >> Paul,
> >>
> >> You don't need all of the data columns.  Just a single column of
> >> either visual density (labeled either D or V) or Lab L (L label)
> >> data.  The icc-create droplet will simply assume zero values for 
Lab
> >> a and Lab b if no actual data are present.  The density or L 
values
> >> can also be in any order and will be automatically sorted (high 
to
> >> low for L and low to high for D).  This with the 2.3.1 version 
on a
> >> Mac but I assume it is the same for the PC version.
> >>
> >> Carl
> >>
> >
> >
> >
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