Digital BW, The Print

There is a file in the QTR download called "Ideal Density."  It plots
ideal density against dmax.  But the dmax range given is relatively
low, what you'd get from matte papers.  Where would one find the ideal
density values for papers with a higher dmax, such as SR and Innova F?

Ed

edrudolpho wrote:
> There is a file in the QTR download called "Ideal Density."  It plots
> ideal density against dmax.  But the dmax range given is relatively
> low, what you'd get from matte papers.  Where would one find the ideal
> density values for papers with a higher dmax, such as SR and Innova F?
> 
> Ed  
> 

There's a file called CurveEvalV2.xls in the QTR group files section 
which has them from dmax of 1.30 to 2.60:

http://tech.groups.yahoo.com/group/QuadtoneRIP/files/

Howard

What is an "ideal" density ramp?  Shouldn't matching the monitor be a
primary goal?  Are these "ideal" densities used by any standard working
space?

 

In the past I argued in favor of the linear Lab distribution that these more
traditional B&W approaches use, but that was in an era of 8 bit files where
I thought the rather standard Gray Gamma 2.2 "wasted" precious scale in its
compressed shadows.  With high bit files being the norm now, I've switched
my recommendations to using that standard space and its non-linear ramp.
I'm not sure I've ever seen a chart of density or Lab L distributions for
Gray Gamma 2.2 (or other common standard space, for that matter).  I label
some of my 21-step test files with selected GG 2.2 densities that I've found
just by measuring test strips that were produced by "color managed"
workflows like those that use Roy's "Create ICC" program.

 

Paul

www.PaulRoark.com <http://www.paulroark.com/>  

 

 

  _____  

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Howard
Shaw
Sent: Monday, December 25, 2006 12:09 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Ideal Density Values?

 

edrudolpho wrote:
> There is a file in the QTR download called "Ideal Density." It plots
> ideal density against dmax. But the dmax range given is relatively
> low, what you'd get from matte papers. Where would one find the ideal
> density values for papers with a higher dmax, such as SR and Innova F?
> 
> Ed 
> 

There's a file called CurveEvalV2.xls in the QTR group files section 
which has them from dmax of 1.30 to 2.60:

http://tech. <http://tech.groups.yahoo.com/group/QuadtoneRIP/files/>
groups.yahoo.com/group/QuadtoneRIP/files/

Howard

 



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

Thanks Howard.... :-)

Ed

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Howard Shaw
<glassman@...> wrote:

>

> 
> There's a file called CurveEvalV2.xls in the QTR group files section 
> which has them from dmax of 1.30 to 2.60:
> 
> http://tech.groups.yahoo.com/group/QuadtoneRIP/files/
> 
> Howard
>

Beware the wild goose chase.  If I recall correctly, those "ideal" density values were just linear steps of L* converted into density figures.  Linearity in a final printed greyscale ramp is not at all "ideal".  It is ideal for the intermediary step of linearizing a printer before profiling but the end product but, in order to be aethetically pleasing, will need some curvature in the greyscale ramp because of (in particular) the relatively weak blacks we get else suffer a flat look.  If one were to produce a set of ideal density values for a given paper white and ink black it should account for media relativity (adjustment for paper white) and black point compensation.


edrudolpho <erudolph@...> wrote:          There is a file in the QTR download called "Ideal Density." It plots
ideal density against dmax. But the dmax range given is relatively
low, what you'd get from matte papers. Where would one find the ideal
density values for papers with a higher dmax, such as SR and Innova F?

Ed 



         


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