QTR-Quadtone RIP

OK Joost, here we go--guaranteed to 99% confuse.

 1-- Profiled monitor using Colorvision or Eye-one hardware or (with a
little of what in US is termed "Kentucky windage") using Adobe Gamma.

 2-- Your own "QTR Create ICC" generated paper/ink/printer profiles OR
the generic Gray Matt/Gray Photo profiles provided with the QTR issue.

 3-- You are correct in your understanding of softproofing. That is
what it is supposed to do. Assuming your monitor is properly profiled
and your printer is linearized it will give you a very accurate
picture of what your file will look like when printed. (Usually a bit
shocking if you have only looked at the screen image while editing
it.) Since Lab, in my understanding also, seems to be the target for
linearizing, I assume that is why it is recommended that one convert
files to the Gray Lab profile before editing them.(in practice , I
personally haven't seen much difference between Lab space,GG2.2 or
GG1.8 because to me they all look the same on the monitor anyway while
editing without softproof on.)

 4-- Here just IMHO-- It has been my experience that, when I have done
a good job of editing a file I want to print, it shows very little
change under softproofing beyond the dulling down due to the papers
limited dynamic range showing. On the other hand, I often work in
rapidly changing ambient light situations which isn't a good practice
but is better than no practice. In that circumstance softproofing
seems to help overcome some of the difficulties in working that way.
Toggling between views then often Does show big variations and I can
edit to compensate. It has also been my experience that, if properly
edited and OK under softproof, a file can be printed directly without
any profile conversion at all and just dumped to the printer via QTR.
That would seem to validate your Lab/linearize point also. I don't
normally do that but generally convert to profile before printing as
my old eyes may just be missing subtleties showing in the other prints.

I can't really say what is transpiring with Frans' efforts. It defies
my experiences. I'm almost inclined to recommend that he quickly go
out and buy a fist-full of lottery tickets as his luck seems to be
running well;-)

Hope some of this has made sense to you.

Regards,
Duane

--- In QuadtoneRIP@yahoogroups.com, "Joost Horsten" <j.h.j.h@...> wrote:
>
> --- In QuadtoneRIP@yahoogroups.com, "fwaterlander" <frans2001@> 
> wrote:
> >
> > 
> > As a "last resort" I browsed through the QuadToneRIP directory on my 
> > harddrive and discovered, in the icc subdirectory, a readme file with 
> > instructions to Convert to Profile using either Gray Matte Paper or 
> > Gray Photo Paper. To the best of my knowledge this information is not 
> > included in the QTRgui help or User guide. After conversion I get the 
> > excellent monitor-to-print match that I was hoping for and I will NOT 
> > have to tweak my images!
> 
> Now I must confess I'm completely lost :-(
> 
> This is what I did when I started off with QTR 9 monts ago (as 
> mentioned above), but without good results. The difference between 
> print and screen only increased. I also don't understand why this 
> should be needed, since the whole idea of profiling in QTR (as I 
> understand it) is to linearize your whole system against the LAB space.
> 
> Furthermore, Tom explained in this thread a much different use of these 
> very same profiles, i.e. softproofing. I thought I understood that (teh 
> softproof compensates for the fact that paper cannot show the whole 0-
> 100 lab scale). 
> 
> Perhaps its my scientific training of years ago, but I just can't bear 
> I that apparently still don't understand this... Can someone more 
> knowledgeable than I bring some (white) light in my (black) darkness??
> 
> Joost
>