QTR-Quadtone RIP

Roy Harrington wrote:
> On Dec 26, 2007 6:04 PM, Ernst Dinkla <E.Dinkla@...> wrote:

>> I will check the 3 color engines that I have in Photoshop:
>> ACE, ICM and Kodaks's CMM to see whether that gives
>> different results.
>>
> 
> I'm pretty I've tried the various CMMs with Photoshop in the Mac (Adobe Ace,
> ColorSync, Apple CMM)
> and got the same results.  There's seems to be a lot of lore about that says
> different CMS's can
> work differently.   How can this go along with printer companies, paper
> companies providing
> print profiles that people can use with different products?  Do Epson
> profiles only work with Photoshop?
> 
> Consider how profiles are made -- you print a target WITHOUT using CMS,
> right?
> Then measure it and create a profile.  The CMS had NO part in the profile
> creation so how
> could the profile be in any way tied to a CMS?
> 
> I just don't get how this all is supposed work if there's no "standard" that
> everybody has to meet,
> but I suspect there's more to it (there usually is) and I don't know what it
> is I don't know about :)
> I think B&W is simple enough to have a fixed way to work but color has too
> many tradeoffs.
> So different products can choose different tradeoffs.

For the Color Engines Adobe's ACE, M&'s ICM and Kodak's CMM 
I do not see much differences happen in Photoshop CS on 
conversions from QTR-Lab to a custom matte QTR printer 
profile, Perceptual Rendering, BPC on and off,16 bit 
Greyscale image.

I also added the original histograms in the respective color 
engines as I see a huge difference on my monitor between ACE 
and ICM, the last is far too light, the Kodak CMM is very 
close to Adobe's ACE. The histograms do no show that so 
something goes wrong with ICM, any greyscale image 8 or 16 
bit with or without assigned profile is shown too light, no 
QTR profile related issue as dotgain, 2.2 Gamma do the same. 
I think it doesn't do greyscale profiles at all. There's no 
problem in color though. Anyone to confirm this ? I always 
use ACE so I never saw that before and a quick google 
doesn't show messages on the subject.

http://www.pigment-print.com/Quad%20QTR/Images/Totaal.jpg


-- 
Met vriendelijke groeten,  Ernst


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