QTR-Quadtone RIP

At least with the R2400 on a PC, there's also a difference in the 
pattern in which the heads lay down the ink. with the 2400, you can lift 
the lid and as long as you hold the front panel in place watch the ink 
being laid down as the head traverses the paper. With the Epson driver, 
ink is being laid down gradually over a broad stripe of the paper as the 
paper moves below it; using QTR the ink is laid down over a much 
narrower strip, building the density in that strip much more quickly. I 
occasionally see the same problem with QTR showing narrow white lines, 
repeated at very regular intervals while the Epson driver in ABW mode 
doesn't show these. My guess would be that the Epson driver is geared to 
laying down the ink in a pattern that hides a misfiring nozzle, by using 
the misfiring nozzle as part of a pattern in all horizontal lines, while 
the driver QTR uses assumes the heads are perfect, and lays down the ink 
from the faulty nozzle all in the same line.

I hope that makes some sense!

My solution is to give up and use the printer for other things (or use 
ABW if I need a monochrome print), and come back to printing with QTR 
another day ... not an ideal solution even for me.

I'm still using the OEM inks, as I haven't found suitable monochrome 
inks in the UK.

mike



On 19/05/2010 17:20, Roy Harrington wrote:
>
>
> The main difference with QTR vs the Epson driver is that it uses less
> color inks --
> mostly the grays because that helps in avoiding metamerism.
>
> I use a 3800 and don't see a problem but under magnification I guess you
> could
> see the dots. I use both of those papers with all factory settings so
> if you've
> changed settings I don't know if that could be the trouble.
>
> Also, I'm a little unsure of the ink and profiles you are using since I
> don't think MIS has Ultratone inks for the 3800.
>
> Roy
>
> On Tue, May 18, 2010 at 9:35 PM, kitara444 <kitara444@...
> <mailto:kitara444%40yahoo.com>> wrote:
>  > Hello,
>  >
>  > i am trying to make good bw-prints with QTR, MIS Ultratone and Epson
> Pro3800.
>  > My problem is, the prints has horizontal fine white lines, like bad
> nozzles or banding, but the nozzle check is always ok. Interesting is,
> these fine lines are only in prints i made with QTR, by resolution 1440
> an 2880. When i am printing through Epson-Driver the quality of the
> prints is 100% ok, without the lines.
>  >
>  > I tried different papers like Ilford Gold Fibre Silk or Harman Gloss
> FB AL, i tried to setup a wider gap to the printhead, no better prints.
> In 2880 resolution the prints are a bit better, but with a magnifying
> glass i can see the lines again.
>  >
>  > What does QTR doing differently than the OEM-Driver, what produces
> these lines?
>  >
>  >
>  >
>  > ------------------------------------
>  >
>  > Yahoo! Groups Links
>  >
>  >
>  >
>  >
>
> 
>
>
>
>
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-- 
mike finley photography
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