QTR-Quadtone RIP

On 06/04/2011 02:16 AM, silverhound905 wrote:
> I've recently started using QTR for printing monochrome prints and I'm finding that my prints suffer from a slight greenish/yellowish tinge when using the UCmk-EVelvetFineArt-warm curve. I'm using an Epson 3800.
> For the sake of comparison, I had a friend print the same images using ImagePrint and the prints did not show any noticeable color shifting.
> I'm not advanced enough yet to start creating my own curves, but I was wondering if there was anyway to minimize the metamerism using the QTR canned profiles.

Both prints compared to the same light source and one person checking 
the prints? If yours is too green then mix in some magenta ink to get 
the match. Compare again. When right you have a metameric match. Now go 
outside in daylight and compare again, if they are no longer alike you 
got a metameric failure. If one of the prints shows more (unexpected) 
color shifts than the other in changing light then you can say that 
print has less color constancy to changing light (which often is called 
wrongly "metamerism"). That character of a print usually is related to 
1/ FBA content of the paper so fluorescent behavior (fluorescence 
happens in inks too but not that often), 2/ dyes or pigments that are 
color inconstant 3/ the way inks are laid down: black/grey generation 
instead of composite greys (CMY mixes for grey). 4/ some lesser known 
issues.

So get your ink mixing right, get your paper right.
QTR is most likely not the cause of the color mismatch you see.


-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

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