Datacolor User to User Support Group.

Ken:
I print a lot of art reproduction prints, and I will basically say,
that a profile is meant to get you in the ball park, when dealing with
 precise color rendering. 

I find that most times I can get quite close using "global" color
corrections using either curves or Hue/saturation layers.
Occassionally, some colors require spot corrections as you note.

A lot depends on how you did you original image capture. Some pigments
just capture differently and require localized corrections to render
correctly on the print. 

Also, your display, even though it maybe calibrated, can not properly
interpret what is being printed.

A lot of variables at work here. As you work with making print more
and more, you will soon find the types of original artist's colors
that require localized color controls to render correctly in the print.

John Nollendorfs
--- In colorvision_group@yahoogroups.com, "prof_mgt551"
<prof_mgt551@...> wrote:
>
> Thanks for your thoughts on this subject.
> 
> 1. I first used perceptual rendering, then did a series of test prints
> using also Relative Colorimetric and Absolute Colorimetric.
> 2. I have tried both checking on and off paper white and black
simulation.
> 3. I use a Solux viewing lamp to view the prints. 
> 4. I use SpyderII Pro set to D65 and 2.2
> 
> I originally did a profile of the Epson Radiant Watercolor using the
> smaller 225 patch. But wasn't completely satisfied with it, so when I
> upgraded the software to 2.0, I went ahead and printed the 729 patch
> plus the extended gray patch. This new profile was improved over the
> original 225 patch profile. I don't know if it was using the 729 patch
> plus extended gray patch or the new software version, but the standard
> test target printed a very close match to the soft proofed version on
> my screen. It is just some of the art prints have these hues, which
> cause problems. They are close but not as close as is possible, which
> I know because I can do localized color adjustments and get them to be
> almost a perfect match. So I don't know where to go from here? I have
> posted these experiences on the DP Review printing forum to see if
> people using other profiling systems and are trying to get highly
> accurate color reproduction find the same problems.
> 
> Ken
> 
> > What rendering intent are you soft proofing and printing through? (and
> > when you're soft proofing in Photoshop, you're doing this by going
into
> > View:Proof Setup:Custom, selecting the profile and rendering intent,
> turning
> > on Preview, and leaving the other check boxes off (having the paper
> black
> > and paper white simulation on makes the soft proof visually too
> muddy, and your
> > brain adjusts well enough for those things, so I'd recommend not
> using them).
> > 
> > What light source are you viewing the prints under?
> > 
> > You've got the display calibrated to D65, 2.2, correct?
> > 
> > Best regards,
> > 
> > -- 
> > David Miller
> > Senior Software Developer, Digital Color Solutions
> > ColorVision
> >
>