Digital BW, The Print

Paul,

By all means, please be sure I was not challenging the solid results 
your approach provides : besides, I intend to dig further into this 
and find out more about this workflow at least for knowledge purpose. 

One thing I do not understand in the new QTR-ICC using your approach 
is the existence of the psd.raw (binary greyscale image that clips 
black and white ends out of specified boundaries ? ). 

The process (?) :
- create linear stepwedge 16b by "bending" the curves as per your 
recommendations
- read this, create txt of the linearised datas
- then apply the acv to the psd.raw and save it (this is how the acv 
is incorporated to the profil)

Then you do not need the acv at all for future printing ?

What happens when both are dragged to Create-ICC? The txt provide the 
linear datas while the psd.raw is used to clip out of (paper) gamut 
whites and blacks (mapping white and black points) and embeds the 
curve shape ? Shouldn't the Create-ICC do it whithout the psd.raw ? 

Or is it that when acv is applied to psd.raw the clipping happens in 
PS and the Create-ICC "takes" linear datas and "plot" them on the 
psd.raw greyscale :

LinearData 1  -> acv data 1
LD2 -> AVCD2

For instance LD White = L*97 comes to ACV 255, LD Black =L*17 comes 
to ACV 0, then L*57 (or 54) comes to  ACV 128...

The principle of it is not very obvious to me and I'm not sure I can 
best use it being so...lost.

Olivier

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@...> wrote:
>
> Olivier,
>  
> 
> > I could not get connected to the link above detailing the 
workflow.
> 
> My general index is at http://home1.gte.net/res09aij/index.htm.  As 
far as I
> know the pages are working, but the server does sometimes need a 
refresh or
> two to load a page.  
> 
> 
> > ... I can't figure out the
> > superiority of avc vs QTR (except direct printing from PS).
> 
> That was not the point of my post and not what I intended to 
suggest.  I'm
> saying putting the *.avc curve into an ICC has some advantages to 
using the
> curve in Photoshop.  If QTR or any system is working for you, I 
don't
> recommend changing.
> 
> In general, I prefer approaches that give good results with the 
Epson driver
> with no additional curve, software, or special processing.  This is 
an
> attempt to be sure those who are starting out have the positive 
feedback of
> quick and easy success.  It also gives a fall-back mode when the 
more
> sophisticated approaches fail for some reason.  Then, on top of 
this simple,
> easy approach, I try to have different stages of sophistication 
that can be
> used.  Going forward, the ICCs and Create ICC fit nicely into this 
approach.
> 
> I think many will appreciate the flexibility and power that rips 
like QTR
> offer.  I am in no way being critical of those approaches and 
programs, and
> my approach is not inconsistent with the use of those programs.
> 
> Paul
> www.PaulRoark.com
>