QTR-Quadtone RIP

Ferdinand,

Blocked up shadows in prints (compared to your monitor) is often due 
to setting the monitor luminance too high.  Some software vendors 
recommend very high monitor luminance, which I consider too high.  

If you have an accurate printer profile, I would generally trust it 
to reproduce fairly accurately.  Your Eye One will read the luminance 
levels accurately and translate those into a profile, with correct 
density and color (not perfect, but very close).  There are really 
no "user settings" that can skew your results.  

With monitors, however, the user can choose both the luminance level 
and the color temperature, which can influence the final display.  If 
your monitor is set to a luminance above 100 cd/m2, this could be 
your problem.  Your image will appear very bright, and during 
editing, you may be inclined to darken the tones in Photoshop.  These 
edits end up in your final numbers, and ultimately in your print.  
You would need to view your print under bright lighting to get a good 
match.  When viewed under less brilliant lighting, shadows can look 
very dark, blocked up, and with little separation.  

Try calibrating your monitor to about 90 cd/m2 and then compare your 
monitor to your print and see if this improves your match.  

Lou

--- In QuadtoneRIP@yahoogroups.com, "ferdinand_paris" 
<ferdinand_paris@...> wrote:
>
> Thanks to Roy and Eric for making the clear the point about which 
txt
> file to use for creating a profile.  What you say made sense the 
more
> I thought about it, and this seems to be what the "Eye-One-
ReadMe.pdf"
> document implies.  
> 
> However if I do as instructed I am finding that my prints and
> especially the shadows seem a bit darker than the screen (which is
> also profiled with the i1).  While I realise that colour management,
> linearisation etc are not exact sciences, I guess having spent the 
big
> bucks on an i1, I was hoping to get a bit closer.  I have remeasured
> the test strip printed with the linear curves several times, and
> compared the results.  There can be a fair bit of variation (within
> the range +/- 1%), especially in the highlights.
> 
> In relation to the internal name for the profile, can I suggest that
> you append rgb to the internal rgb profile name.  If I am printing
> thought Qimage, then I use the rgb version, and if printing through
> PS, I use the greyscale version.  Thus it is helpful to have both, 
and
> to have internal names to indicate which is which.
> 
> I am still keen to hear about those who are using the CM in Qimage 
for
> B&W and those who are not, and if not, why not
> 
> Roy - can you please explain the following a bit more?  I assume 
that
> this will create a generic profile *with* BPC.  So you literally 
just
> have a text file containing "16 96"?  Wild!
> 
> > It's very easy to make another generic profile that does the same
> > as QTR-RGB Matte Paper -- this may solve any BPC issue. (Just put 
> > "16 96" in a text file and drop it onto QTR-Create-ICC-RGB).
> 
> F_P
>