Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, CDTobie@... wrote:
>
> 
> In a message dated 6/7/07 3:14:56 AM, michele@... writes:
> 
> 
> > No idea why this red bias. The QTR target is a Greyscale 8 bit file,
> > if you have QTR this file is under
> > 
> > Programm Files/QuadToneRIP/Eye-One/Step-21-gray.tif
> > 
> > I just opened this file, PS warmed it was in a different color space,
> > I left it on its color space (don't color manage). Then Print With
> > Preview, picked the PFP profile I made, I selected Relative
> > Colorimetric and Black Point Compensation. In the printer driver I
> > pick Premium Glossy Photo Pager and 2880dpi (that was the setting I
> > used to print PFP targets).
> > 
> Well, for starters we recommend you try Saturation intent for your B&W 
> printing, and always recommend BPC be turned off with PrintFIX PRO
profiles: our 
> profiles are designed for use without BPC, since its not available
in all 
> applications.
> > 
> > Now, how can I neutralize this PFP profile?
> > 
> Try printing at the settings above, and see if that changes your color 
> balance... the other fix, of course, is to move the red to green
color adjustment 
> slider a couple of points away from red, but that should not
actually be 
> necessary.
> 
> >  And, at the same time, how
> > can I achieve deeper blacks (at least comparable to ones obtained with
> > the ABW printing mode)?
> > 
> > My guess is that its the Black Point Compensation thats the
culprit here. 
> Even though the color mode is not always capable of as dense a black
as AWB mode 
> (it varies with the paper and the media setting) there shouldn't be
a huge 
> difference. So try unchecking BPC, and then (if you are willing to
start from 
> scratch again) go to PFP's Media Setting Check screen, and see if
there is any 
> media setting that will offer a deeper black. If so, reprint your
targets at 
> that setting, and see what that offers.
> 
> But even without reprofiling, I suspect you will get deeper blacks
and more 
> neutral grays just by turning BPC off, and using the Saturation
intent. One or 
> two quick slider adjustments would be the most you'd need, even if
that didn't 
> zero out your neutrality. One more tip:   if you tweak your
neutrality, try 
> to err to the red side of neutral. Fractional red values are quite
acceptable, 
> but green values, even fractional ones, are unpleasant.
> 
> C. David Tobie
> Product Technology Manager
> ColorVision Business Unit
> Datacolor Inc.
> CDTobie@...
> www.colorvision.com
> 
> 
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> 
> 
> [Non-text portions of this message have been removed]
>

Just reprinted the target using Saturatin as rendering intent and
unchecking BPB. Here you go:

1	0	97.15	1.55	-0.68
2	5	93.53	1.37	-0.28
3	10	89.71	1.46	-0.82
4	15	86.01	1.46	0.25
5	20	82.09	1.85	-0.48
6	25	78.40	1.64	-0.78
7	30	74.49	1.29	-0.77
8	35	70.06	1.73	-0.70
9	40	65.75	1.38	-0.71
10	45	61.85	1.53	-1.09
11	50	57.60	1.43	0.19
12	55	52.73	1.47	-0.31
13	60	47.96	0.90	-0.58
14	65	43.04	1.41	-0.12
15	70	38.12	1.06	-0.23
16	75	33.09	0.40	1.19
17	80	27.02	0.24	1.26
18	85	20.41	0.16	0.67
19	90	14.15	0.34	0.57
20	95	7.98	-0.23	0.50
21	100	6.67	0.24	0.97

Blacks are deeper but reddish cast still important. Isn't it? To
facilitate comparation here a chart with Befor/After LAB_A and LAB_B
values:

http://www.flickr.com/photos/micheleberti/534796846/

Now the PFP profile is a combination of two readings (colored patches
and extended grays) and you suggested to tweak the  red to green...
where? Sinca I can't pick the composite profile from PFP software I
wonder if I should move red to green in the profile for color patches
or in the one for extended grays?