Digital BW, The Print

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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