Digital BW, The Print

Carl,

When you make the icc profile you should be printing the target with No Color 
Management so it doesn't matter what the file working space is.   So the icc 
profile is not tied to that working space at all --- it's usable by anyone.

But, notice that if they are using a different working space the conversions that
happen are different.   Example: if you have a 21step as Gray Lab, print it.  Now
Assign to GG 2.2 what you see on the screen is different, now print again, what you
see on the print has those same changes in look.  The print matches the screen.

If however you Convert to GG 2.2  (the numbers in the file change -- don't save
this modified 21step -- its not really a 21step any more),  what you see on the
screen does not change.  It still matches the original Gray Lab version.  Print it
and the print still matches the original Gray Lab print.  Both cases the the 
print matches the screen.    Also in all cases the soft-proof matches the print.

Color Management is a strange black box but its almost like magic how everything
(at least should) match up.

Roy


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl Schofield <scho@m...> 
wrote:
>
> Roy,
> 
> Good point.  I've been doing all of my work in QTR gray lab work  
> space, but I wasn't aware of the 95-100 difference compared to gamma  
> 2.2.  Does this mean that if I make and icc profile using my QTR gray  
> lab working space someone else using gamma 2.2 work space will  
> experience a different result if they apply the same profile for  
> printing or softproofing?
> 
> Carl
> 
> On Oct 20, 2005, at 4:30 PM, Roy Harrington 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
> 
> 
> 
> [Non-text portions of this message have been removed]
>