QTR-Quadtone RIP

Joost

I've tried several times to write an explanation of my understanding and
they always seem to get too complicated (and long) so maybe a few questions
and further dialogue will help both of us understand this.

Do you use QTR-RGB-LAB (or QTR-Gray-LAB) space? If so how/when.
Do you use QTR-RGB Matte Paper space (Gray equivalent)? If so how/when.

I don't generally use these generic spaces, but use ones I created for my
curves. When I use mine or the generic paper space to create a custom soft
proof in the manner I describe, I see a quite noticeable change when I
enable the soft proof. Others, notably on the BWPrint list, swear by this
approach.

Perhaps if you describe your workflow to get a print matching your monitor,
we would be able to discover where either you or I have misunderstood the
process.

Tom Moore


> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of Joost Horsten
> Sent: Tuesday, February 27, 2007 4:57 PM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] Re: Why are Epson 2200 prints too dark
> 
> --- In QuadtoneRIP@yahoogroups.com, "Tom Moore" <r.t.moore@...> wrote:
> 
> > [...] converting an
> > image to the QTR-RGB-LAB space is not enough. You also need to use
> Photoshop
> > soft proof, using the profile QTR - RGB LAB space as the Device to
> Simulate,
> > selecting Relative Colorimetric, Black Point Compensation and
> Simulate Black
> > Ink (using PSCS2 terminology).
> >
> > Once you set up and select the soft proof you will see the image
> flatten
> > quite a bit - I expect a lot closer to your print, although it
> likely still
> > won't be perfect.
> 
> Tom,
> 
> I must confess I'm a bit confused. I tried soft-proofing earlier with
> no noticable advantage, so I left it aside. Based on your statements
> I tried it again, but like Frans, I don't see any difference
> whatsoever on my monitor with or without softproofing. I also would
> have difficulty to understand why I would see a difference, since if
> the system is well profiled anything should be linear. The typical
> use of softproofing as I know it, e.g. checking out-of-gamut colours,
> is not applicable in B&W printing.
> 
> > That is because, although you are now using the right
> > technique, the profiles you are using are generic. If you have a
> measuring
> > device, you can use QTR-Create-ICC to create custom ICC profiles for
> > specific ink/paper combinations. These can give very close monitor
> print
> > registration, assuming the rest of your system is calibrated.
> 
> I CAN understand that this step allows you to softproof the effect of
> paper color and ink tone. But once again, if the monitor is well
> calibrated and if the QTR curves are well linearized, I fail to
> understand how the icc profile qreate by QTR-Create-ICC can be
> anything else then a linear profile. What do I miss??
> 
> Joost
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
>