QTR-Quadtone RIP

I noticed something important this weekend as I was working to tweak
some QTR profiles.

I was comparing tones from old patches to some that were freshly out
of the printer and finding some hard to explain differences.

In trying to figure out what was going on I got out a patch from the
night before and they were much darker.

Basically I noticed that the 100% patch of Museum Black on Photo Rag
takes at least 2-3 hours to dry down to its end density.

Patches that read 1.53 five minutes out of the printer read 1.58
after an hour and 1.63 after drying over night.

This could certainly account for some challenges I have had in the
past getting smooth ramps.

This is definitely going to change my calibration technique.

James

[Non-text portions of this message have been removed]

absolutely. In fact density will continue to settle in for some time.
12-24 hours is probably safe though. I usually wait 24 for a final
linearization, but it's different software.
Drydown is a big deal, for linearization and profiling both.
Tyler

--- In QuadtoneRIP@yahoogroups.com, James Haney <jhaney@...> wrote:

>
> I noticed something important this weekend as I was working to tweak
> some QTR profiles.
> 
> I was comparing tones from old patches to some that were freshly out
> of the printer and finding some hard to explain differences.
> 
> In trying to figure out what was going on I got out a patch from the
> night before and they were much darker.
> 
> Basically I noticed that the 100% patch of Museum Black on Photo Rag
> takes at least 2-3 hours to dry down to its end density.
> 
> Patches that read 1.53 five minutes out of the printer read 1.58
> after an hour and 1.63 after drying over night.
> 
> This could certainly account for some challenges I have had in the
> past getting smooth ramps.
> 
> This is definitely going to change my calibration technique.
> 
> James
> 
> [Non-text portions of this message have been removed]
>