QTR-Quadtone RIP

Tom,

Why is there no mention in the QTRgui Help or User guide about what 
resolution the profiles are based on or how to modify your image for 
different resolutions and how did you find out?

I get excellent monitor-to-print matching using the Epson driver for 
both color and b&w images. Of course the Epson driver has its 
limitations for b&w images that I hope to overcome with QTR.

When I use the Proof Colors feature in my PS CS per your suggestions 
(Simulate Black Ink is grayed out), I do not see any change when 
toggling between straight display mode and Proof Colors mode.

Your help is greatly appreciated.

Frans Waterlander

--- In QuadtoneRIP@...m, "Tom Moore" <r.t.moore@...> wrote:
>
> Frans
> 
> Unless indicated otherwise in the curve name, curves usually are 
designed
> for 1440 dpi. Curves designed for 2880, by convention have the term 
2880 in
> the curve name.
> 
> You can use a 1440 curve at 2880 with reasonable success by 
reducing the ink
> limit by about 35%. You can do the converse by increasing the limit 
by the
> same amount.
> 
> With regard to matching image and print many QTR users get quite a 
close
> match, but there are a lot of factors involved, including how good 
your
> monitor profiling is. You state that your prints match quite well 
with the
> Epson driver. I presume that refers to printing color images. It 
could be
> that black and white images might make more visible, differences 
that are
> masked by presence of color.
> 
> In any event, assuming your monitor is well profiled, simply 
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. 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.
> 
> Good luck
> 
> Tom Moore
> 
> > -----Original Message-----
> > From: QuadtoneRIP@yahoogroups.com 
[mailto:QuadtoneRIP@yahoogroups.com] On
> > Behalf Of fwaterlander
> > Sent: Monday, February 26, 2007 6:19 PM
> > To: QuadtoneRIP@yahoogroups.com
> > Subject: [QuadtoneRIP] Re: Why are Epson 2200 prints too dark
> > 
> > Joost,
> > 
> > Thanks for your reply. I indeed use the Epson OEM ink cartridges 
and
> > Windows XP Home Edition.
> > 
> > After reading more on this forum I changed my dpi from 2880 to 
1440
> > and now my prints are much lighter, but they are now way too light
> > and seem to lack contrast and my blacks are too light as well.
> > The QTRgui Help feature nor the User guide say anything very 
specific
> > about what dpi to use, except that on the one hand I am let to
> > believe that it doesn't matter much (it matters a lot in my case!)
> > and on the other hand it is suggested to change dpi if results are
> > not satisfactory; I can't find any definitive instructions on what
> > dpi to use and how it would make a difference.
> > 
> > On your suggestion I converted my image, previously with the Adobe
> > RGB (1998) profile, to QTR - Gray Lab and this doesn't change the
> > print one bit.
> > 
> > So, is this the kind of monitor-to-print mismatch that I should
> > expect, which would require me to retweak every image before 
printing
> > using QTR? That's hard to believe given the praises that I read 
about
> > the program.
> > 
> ...
>