Datacolor User to User Support Group.

Thank you for your answers. I will try with white and black
compensation newt week-end (not at home this week). It is matte paper...

I don't have photoshop but Qimage. The chart is printed with Qimage
then measured with PrintFix Pro (I wil update, Ididn't know that I
could upgrade. Thanks colorvision!).
When I say that white becomes blue on soft proof, it is in Qimage.
Turning on black compensation in Qimage doesn't change anything. I've
never soft proofed in PFP.

What I don't understand with the blue cast:
- when I calibrate the spectrocolorimeter with the paper, all the
patch are as I see them on the paper. That is, I think, a ggod thing...
- when I calibrate it on the calibration base, all white colors are
blue. This is quite different from what I see on the paper! And I
should see on the screen what is on the paper during the measurement.

My english is poor and I'm sorry. What I understand from the last (and
long) answer is that PFP can't change anything to my uncontrasted
softproof in Qimage. What I can try is to turn off black ink
compensation in Qimage.


--- In colorvision_group@yahoogroups.com, David Miller <dm2363@...> wrote:
>
> 
> On Jan 20, 2008, at 4:45 AM, boborlehanneton wrote:
> 
> > PrintFixPro 2
> > I read the message about "Show Edits in Preview" box.
> >
> > My prints are good and are similar to my screen. But the soft proof is
> > not contrasted as if there were a veil.
> >
> 
> That "veil" is from your measured black. PrintFIX PRO 2 (which, by
> the way, you should upgrade to Spyder3Print) always softproofs using
> the measured black; which is never going to be a "perfect" RGB black.
> This produces reduced contrast in the softproof; more so if you're
> profiling a matte paper (higher "L" values for black, usually in the
> 18-24 range) rather than glossy or luster (much lower "L" values for
> black, usually in the 3 to 5 range).
> 
> There's nothing you can do to change this in our software; Show Edits
> won't affect this. But in Photoshop, you can softproof with black ink
> simulation turned off (this is Photoshop's default). Go into View:
> Proof Setup:Custom in Photoshop, select the printer profile and
> rendering intent, and check the Preview box.
> 
> >
> > Another issue:
> > - if I use the calibration base to calibrate the spectroclorimeter,
> >
> The word "if" should not appear here...:-)
> 
> You should ALWAYS calibrate the spectro on the base; never on
> anything else!
> >
> > there is a blue cast on the white patch. If I don't compensate the
> > white point, white appears blue on soft proof (prints are good). If I
> > compensate the white point, soft proof is yellow.
> >
> 
> There's supposed to be a blue cast on the white patch (meaning:
> the white of the paper that you're profiling/measuring); because that's
> the color of the paper. Most papers measure with a slight blue cast.
> 
> When you softproof through the profile in PFP, the paper white is  
> simulated
> that way because... that's how the paper measured...:-) "By the  
> numbers",
> it's correct. We don't have a way in our software of turning off  
> either the
> black ink simulation or paper white simulation in our softproof; if  
> you want
> to softproof images that way, when you're printing real images after  
> building
> a profile, you should be softproofing in Photoshop, which is where  
> you'll
> actually be printing your images from. (So this comment goes along  
> with the
> first one, about leaving black ink simulation turned off while  
> softproofing
> in Photoshop; you'll probably find the closest perceptual match  
> between your
> calibrated display, and print, by softproofing in Photoshop with both
> black ink and paper white simulation turned off)
> 
> >
> > - if I calibrate the spectrocolorimeter on the paper (without white
> > point compensation), everything is ok (except contrast) and the prints
> > are nearly perfect. I know it is not the good way, but the result is
> > better...
> >
> >
> That's right, its not the good way, and it will throw all of your  
> measurements
> off in subtle ways, so.... don't do it...!
> 
> *** Spyder3Print
> 
> All existing PrintFIX PRO users can download and install the latest  
> (newly renamed)
> version of the software, Spyder3Print 3.0. You can download the  
> installer from the
> Support:Software Updates download page. It has download links for both  
> the OSX and
> Windows versions. I've attached a copy of the Update Notes to this  
> ticket (please
> read these to see what the new features are, and also about how to  
> install and how
> to copy over your older measurement files).
> 
> Spyder3Print 3.0 can be initialized with your existing PrintFIX PRO  
> serial number,
> and there are no changes in the Targets or the measurement file  
> format, so it's
> completely backward compatible with everything you've already done.
> 
> 
> David Miller
> Senior Software Developer, Digital Color Solutions
> Colorvision
>