Digital BW, The Print

--- 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