Digital BW, The Print

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