QTR-Quadtone RIP

Roy,

At last this makes sense.  To verify, I ran the original JPG with
embedded Gray Gamma 2.2 through Qimage with "printer ICC" OFF, which
theoretically should pass the GG2.2 pixels to QTR, but resized and
sharpened by Qimage (the whole point of using Qi).

Sure enough.  That final print matches the original QTR print of the
TIF made by PS from the JPG with embedded GG2.2 (Qimage out of the
loop entirely)!

One other point seems worth raising.  Your gray-readme suggests
editing in gray-lab, then printing from PS with gray-matte or
gray-photo.  Then you say that "in Qimage only RGB profiles can be
used".  Well, Qimage can certainly INPUT gray profiles (it was happy
to take my test image in GG2.2, for example).  It's just unwilling to
OUTPUT grayscale.

Hence, it would seem possible to edit and save from PS in gray-lab,
input that into Qimage (which will quietly convert to RGB), output
from Qimage to rgb-matte or rgb-photo, and then print with QTR.

I haven't tried that yet, but can you see any reason why that would
print differently than converting into rgb-matte/photo in PS before
running Qimage?  In other words, it shouldn't matter whether PS or
Qimage converts from gray-lab to rgb-matte/photo, right?

Finally, I'll try printing at 1440 and 1440/super to see if they
match rgb-matte/photo soft proofing in PS better than 2880.

I am so impressed with QTR, your responsiveness, and this forum 24
hours after learning about QTR.  I'm paying my shareware fee tonight!

Michael Miller
 
> Hi Michael,
> 
> The first comment I have is that most of the profiles were made with
1440 dpi not
> 2880dpi.   This can effect the overall density of the print.  You
can use 2880 but
> you'll probably have to adjust the Ink Limit Adj till you get it right.
> 
> QTR does not look at the embedded profile in the tiff file --
whether it comes from
> PS or Qimage.  It just uses whatever the actual gray values are. 
However when you
> select QTR - RGB Matte Paper in Qimage this is a conversion from the
source profile
> GG 2.2 to the print profile.  This means all the values are
re-calculated.   The main
> area of difference is the shadows so that explains why your two
prints are different.
> 
> I would think that the best screen match would be to use 1440dpi (or
super) and
> print using Qimage and QTR - RGB Matte Paper printing profile.  
There's not much
> difference with soft-proofing since it's just gray.   PS does allow
a soft-proof with
> Simulate Ink Black which will show the lower dMax if you use the
Matte Paper profile.
> 
> Roy
>