QTR-Quadtone RIP

Carl Schofield wrote:
> Walker,
> 
> I think Roy will have to address that question, but I thought that QTR was relying on 
> Photoshop to handle the front end icc conversion.  I didn't realize that LR was passing the 
> CM buck, but what you say certainly helps explain the problem.
> 
> Thanks,
> Carl

QTR doesn't have any (I)CM and relies on the application to 
do the CM.

I do not share the view that more and more applications will 
rely on the driver's CM to handle color management In fact 
driver manuals usually recommend to use the application's 
ICM and set the driver CM off.. Most of the time driver 
(I)CM is less sophisticated than the application's ICM. I 
write (I)CM as it happens that in some cases there are no 
ICC profiles used in the driver or there is no use of custom 
profiles possible, rendering choices etc not selectable either.

Lightroom will be very handicapped if it has no (I)CM.  In 
what way would Lightroom tag the profile ?  The digital 
camera files it gets have profiles tagged or EXIF data with 
the same content. Either Lightroom should let that file as 
such go through if it doesn't do ICM or it converts the file 
for another profile tag which is considered ICM handling. If 
you can add a custom printer profile to Lightroom's ICM then 
it has to convert the image to that device space and it can 
send the converted data with or without that profile 
embedded as the driver's CM should be off and not act on 
that embedded profile. Why would Lightroom show a BPC 
feature if it doesn't use it ? No switching off for BPC but 
nevertheless.

There are a lot of other processes going on in an 
application and a driver other than CM after one pushes the 
print button. Either the application has to resample the 
resolution of the file to the native resolution of the 
printer or the driver has to do it. The application has to 
communicate with the driver on the settings in the driver, 
the driver has to check the OS spooling. Etc Etc. Hard to 
tell what is waiting on what.

There are some other issues with Lightroom's ICM if I google 
on that subject. As written before one wonders why no 
Photoshop developer co\ufffdperates on that part of the program, 
they could copy the CM software module from PS to do it right.

Even after ICM works correctly Lightroom will need a lot of 
work done in resampling choices and algorithms etc to get 
equal to Qimage as semi RIP.

-- 
Met vriendelijke groeten,  Ernst


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