QTR-Quadtone RIP

Set the ink limit at 25.  Stay off the see-saw plateau.

Often I'll see the incremental increases get so low near the dmax that I set
it 5 or 10 below the actual dmax and set "boost" to the dmax.  So, for
example, it's possible the limit at 20 and boost to 30 and some further test
strips with a 30 ink limit might get the information needed to see what that
final approach looks like.  With the numbers below, I can't see if there is
a final 5 or 10 % or so that ought to be in boost.

The very steep final curve when boost is used helps at the edge of
the plateau sometimes.

You can fine tune the boost without messing up the rest of the profile also
(I think).  Each paper batch could be just a little different; nice to have
some wiggle room in the profile.

Paul
www.PaulRoark.com



On Wed, Jan 26, 2011 at 3:07 PM, Louis de Stoutz <loudest@...>wrote:

>
>
> Printing the ink pattern in calibration mode to determine the ink limit
> (Epson 1400 Claria Black for BO at 2880dpi) I often get a reading with a
> shape like this:
>
> 0 0.03
> 5 1.08
> 10 1.63
> 15 2.00
> 20 2.15
> 25 2.22
> 30 2.22
> 35 2.21
> 40 2.21
> 45 2.21
> 50 2.21
> 55 2.22
> 60 2.23
> 65 2.23
> 70 2.23
> 75 2.22
> 80 2.21
> 85 2.21
> 90 2.20
> 95 2.20
> 100 2.21
>
> What does one do in such a case?
> - ink limit of 25 or 30, because D drops afterwards (although it gets to
> 2.23 much later), or
> - ink limit of 60 ?
>
> Also: is it normal that I get a lower Dmax at 2880dpi (2.23) than at
> 1440super (2.27)?
>
> Thanks, Louis
>  
>


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