QTR-Quadtone RIP

That's an interesting set of tests.   The scatter look from the K3 ABW
test is a curious
phenomena.  Since this is the Epson driver I can only guess what's going on.
I highly doubt it has anything to do with resampling.  The extra dots
are just too far apart
to be mechanical spraying, or resample related IMO.  Some diffusion
dither algorithms can
produce that kind of artifact so that would be my guess.  The fact
that the text is diagonal
may help with seeing it.  My prints, all done with QTR, do not show
anything like that --
Ordered Dither which I recommend and use will not produce that kind of artifact.

At least with QTR I'd expect the different inksets, K3, K7, UT7, UT3D
to all perform similarly
in the particular test.  After all we're talking black text here.  To
through out an other idea:
it might be interesting to use a gradient of text from black to very
light gray to see where
the text clarity visibility peters out.

The 1080ppi issue may be because it theoretically gives a thinner
line.  Many of the 720
files show a lot of ink which tends to bleed over.  At 1080 I suspect
the resampling will
end up with a lighter gray so you get less ink on the paper.

Roy

On Wed, Sep 3, 2008 at 6:51 AM, momoinu_dc <LotusM50@...> wrote:
> I have also printed the file that was made available o9n the
> inkjetmall website.  The resulting text is somewhat smaller than the
> 1pt text I created (also vector text created in a drawing program --
> and also had text in different directions: normal, and at 45 and 90
> degree angles).  It does appear that producing the file to 1080dpi
> resolution seems to make a difference.  It is significantly different
> than my initial comparison with a 360 dpi file.  Since as Roy
> explained, both QTR and the Epson driver down samples to 720 dpi (I
> used the "Fine Detail" setting on the Epson driver which uses 720
> dpi), QTR must be doing something differently than the Epson driver.
> And I don't think I am going too far out on a limb, based on my sample
> print, that it does it better.  The differences are not as huge as
> they are in the promotional Piezography sample print, but it is
> unquestionably significantly better.  I am surprised, based on what I
> saw before.  Certainly from now on, when printing, if I can send a
> file to QTR at 1080dpi, I will.  See a scan of my comparison print of
> the inkjetmall file here:
> http://tech.ph.groups.yahoo.com/group/QuadtoneRIP/photos/view/d000?b=4&m=f&o=0
>
> Is there any reason to believe that QTR won't produce similar results
> with different inksets, such as for example, UT7 and UT-3D?
>
> While a test like this may be of limited value, it does suggest the
> level of detail that is potentially attainable in a print.
>
> Out of curiosity, what is the potential for expanding the QTR software
> to similarly handle full color printing?
>
>