Digital BW, The Print

David et al

Last night I printed a Lab step wedge four times on EEM on my 2100
(workspace QTR Grey Lab).  Once with the Epson driver using an Eye-One made
colour profile for my printer and perceptual intent etc, using Black Only
with gamma 1.8, then Black Only with gamma 2.2, and finally using the canned
QTR profiles 50:50 warm/cool (which would have had linearised Lab values and
hence a rough gamma of 2.2) using the perceptual intent workflow.  I will
read the results with my Eye-One later today when I get the chance and post
them.  Visually, though, the QTR and the Epson colour print look very
similar in density distribution (I won't comment on hue as we know the BO
will be off).  The BO step wedges, I suspect, are going to show a real
bunching of density up around 90-100.

I don't have the Epson inks installed but rather MIS' UC equivalents with
Eboni in the K position.  This should provide, though, a more accurate
comparison of the various workflows.  In no case did I apply a "contrast
curve" to the step wedge ie it is a straight out of the box print.

Steve


> From: Carolyn Frayn <carolyn@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Fri, 25 Mar 2005 14:24:40 -0700
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] Re: Quadtone RIP Faded print
> 
> 
> On 3/25/05 4:19 AM, "Steve Kale" sent the following verbage:
> 
>> 
>> The bit I am puzzled about is that the difference between the Epson driver
>> print and the QTR print - both without curves.  Because they each are going
>> to matte paper each require quite a lot of dynamic range compression. The
>> perceptual rendering workflow of both should take care of that in equal
>> measure - you use perceptual rendering and black point compensation to go
>> from your Adobe RGB workspace to the Epson Matte paper profile and the same
>> for QTR to go from Adobe RGB to the QTR Matte Paper profile.  Yet you say
>> there is a massive difference between the two prints.  Something doesn't
>> make sense there.  Hence I haven't gotten to the point of saying try a
>> contrast curve for the QTR print - you would need one for the Epson print as
>> well.
> 
> The same file going thru the two different workflows do indeed require
> different manipulations to print correctly. Here they sure do.
> 
> Carolyn
> 
>