Digital BW, The Print

My data is from 51 step linear targets printed on HPR and the ABW 
Neutral.  The numbers are for 94, 96, 98 and 100 blacks.  As Roy 
suggested, I am using G2.2 as the working space.  

Screen (info palette): 2, 1, 1, 0
No color Management:  16.9, 16.7, 16.7, 16.7
ICC Workflow:  17.7, 17.1, 17.1, 17.2 (sic)

I repeated the readings several times and took a reading from a light 
patch between each reading.




--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roy Harrington" 
<roy@h...> wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
> <paul.roark@v...> wrote:
> >
> > I've printed several samples this morning to further explore the 
flat
> > 95-100% print separation issue.  Consistent with what Roy noted, 
I've found
> 
> ...
> 
> > 
> > What kind of 100% - 95% print separation (Lab L differences) are 
others
> > seeing with the Create ICC approach?  Is it just my system?
> > 
> > Paul
> > www.PaulRoark.com
> >
> 
> There's been a lot of talk about the 95 to 100 range and what 
separation can be
> and ought to be seen there.
> 
> The one thing that I haven't seen emphasized is the issue of what 
grayspace
> people are using.    100 is always dMax but where 95 falls is 
dependent on
> what grayscale people are using.   Most often the default grayspace 
that is used
> is GG 2.2.   This defines a very dark 95 step.  Put the eye dropper 
on it and
> 100 to 95 is L=0 to L=1 a very much lower slope than most of the 
range.  This is
> a definition issue not a matter of any calibration or device 
quality.   This small
> step is often visible with a nicely calibrated monitor but on a 
matte print the
> difference is very small.   Without CMM this can be fudged but as 
the measurements
> get more precise I think this is a builtin side effect.
> 
> This is one of the main reasons I create the Gray Lab space.  With 
this space
> 100 to 95 shows as L=0 to L=5  -- 5 times the slope.  Note that the 
only thing
> different is the grayspace used -- you make and use the ICC 
profiles identically.
> 
> Roy
>