Digital BW, The Print

I'm in the process of creating curves in QTR for MIS UT-FSN, and I wait at least an hour for 
the test patterns to dry/settle before performing densitometry on them, but I've noticed 
that a day later, the densities have changed slightly (lighter).

My question, then, is how long should one ideally wait before performing densitometry to 
create a QTR curve?

-Steve

Could you see this lighter shift  to the naked eye?
--- "Stephen P. Veillette" <stephen@...>
wrote:

> 
> I'm in the process of creating curves in QTR for MIS
> UT-FSN, and I wait at least an hour for 
> the test patterns to dry/settle before performing
> densitometry on them, but I've noticed 
> that a day later, the densities have changed
> slightly (lighter).
> 
> My question, then, is how long should one ideally
> wait before performing densitometry to 
> create a QTR curve?
> 
> -Steve
> 
> 
> 
> 
> 


		
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I'll have to say no.  The change is in the values I'm getting from the densitometer.  They 
are technically within the margin of error for the intstrument, but the difference has made 
me change my values for ink limit and relative density.

Perhaps I'm being too critical of the numbers?  I'm aiming for an ideal curve, but if density 
is too much of a moving target during the first x hours of a print, then it would seem that 
realizing the ideal would be difficult.

-Steve

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Francis Ford 
<francisford45@y...> wrote:

> Could you see this lighter shift  to the naked eye?
> --- "Stephen P. Veillette" <stephen@v...>
> wrote:
> 
> > 
> > I'm in the process of creating curves in QTR for MIS
> > UT-FSN, and I wait at least an hour for 
> > the test patterns to dry/settle before performing
> > densitometry on them, but I've noticed 
> > that a day later, the densities have changed
> > slightly (lighter).
> > 
> > My question, then, is how long should one ideally
> > wait before performing densitometry to 
> > create a QTR curve?
> > 
> > -Steve

Stephen P. Veillette wrote:

>I'm in the process of creating curves in QTR for MIS UT-FSN, and I wait at least an hour for 
>the test patterns to dry/settle before performing densitometry on them, but I've noticed 
>that a day later, the densities have changed slightly (lighter).
>
>My question, then, is how long should one ideally wait before performing densitometry to 
>create a QTR curve?
>
>-Steve
>  
>

24 hours for Ultrachrome inks drying is the time color experts like 
Bruce Fraser use. That's color, a worst case shift of 1.4 Delta E can 
make a profile differ 3.0 Delta E but that is with CMY hues who shift in 
different directions. With B&W you can probably get a better prediction 
of the shift (based on earlier tests) and edit the curve to what can be 
expected of a truely dried target. Check later on whether that has been 
done right.

Not that they actually wait 24 hours when an offset press has to 
produce. They make a dirty profile of the target, let production 
continue and send another profile after 24 hours.

Ernst

Thank you, thats very good to know.Francis Ford
--- "Stephen P. Veillette" <stephen@...>
wrote:

> 
> I'll have to say no.  The change is in the values
> I'm getting from the densitometer.  They 
> are technically within the margin of error for the
> intstrument, but the difference has made 
> me change my values for ink limit and relative
> density.
> 
> Perhaps I'm being too critical of the numbers?  I'm
> aiming for an ideal curve, but if density 
> is too much of a moving target during the first x
> hours of a print, then it would seem that 
> realizing the ideal would be difficult.
> 
> -Steve
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com,
> Francis Ford 
> <francisford45@y...> wrote:
> > Could you see this lighter shift  to the naked
> eye?
> > --- "Stephen P. Veillette" <stephen@v...>
> > wrote:
> > 
> > > 
> > > I'm in the process of creating curves in QTR for
> MIS
> > > UT-FSN, and I wait at least an hour for 
> > > the test patterns to dry/settle before
> performing
> > > densitometry on them, but I've noticed 
> > > that a day later, the densities have changed
> > > slightly (lighter).
> > > 
> > > My question, then, is how long should one
> ideally
> > > wait before performing densitometry to 
> > > create a QTR curve?
> > > 
> > > -Steve
> 
> 
> 
> 


		
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You can do it immediately after drying with a hair dryer. No shifting 
after that.
--
Bruce Watson


Stephen P. Veillette wrote:

>
> I'm in the process of creating curves in QTR for MIS UT-FSN, and I 
> wait at least an hour for
> the test patterns to dry/settle before performing densitometry on 
> them, but I've noticed
> that a day later, the densities have changed slightly (lighter).
>
> My question, then, is how long should one ideally wait before 
> performing densitometry to
> create a QTR curve?
>
> -Steve
>

Hi,
I've noticed that it does take several days for my prints to " dry
down " to stable tone levels.They are generaly brighter after a couple
of days. Never checked with densitometer but I avoid rapid judgements
because of the observation. Just my personal experience.
Duane





--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Francis Ford
<francisford45@y...> wrote:

> Could you see this lighter shift  to the naked eye?
> --- "Stephen P. Veillette" <stephen@v...>
> wrote:
> 
> > 
> > I'm in the process of creating curves in QTR for MIS
> > UT-FSN, and I wait at least an hour for 
> > the test patterns to dry/settle before performing
> > densitometry on them, but I've noticed 
> > that a day later, the densities have changed
> > slightly (lighter).
> > 
> > My question, then, is how long should one ideally
> > wait before performing densitometry to 
> > create a QTR curve?
> > 
> > -Steve
> > 
> > 
> > 
> > 
> > 
> 
> 
> 		
> __________________________________ 
> Do you Yahoo!? 
> Yahoo! Sports - Sign up for Fantasy Baseball. 
> http://baseball.fantasysports.yahoo.com/