Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Peter Miles <P.Miles@m=
...> 
wrote:
> I've recently installed Roy Harrington's QuadTone Rip 2.0
> 
> Running set-up tests with..
>  PizeoTone selenium inks
>  Epson Matt Heavyweight [A3]
>  Quad Tone Rip 2.0
> 
> 
> WOW - The results are stunning!,  However the photographer whose work I'v=
e
> been printing commented on what appeared to be slight 'tonal' banding
> running down the length of the print. Bands are about 30-35mm apart.
> 
> I checked prints made from the same file printed using the Cone driver - =
no
> banding. 
> 
> While we were looking at the print to see what it was I Turned the print
> over and we could see the same banding pattern on the back of the print! =
 On
> closer inspection we saw the print paper (Epson MHW) had *very* small but=

> regularly spaced 30-35mm wide corrugations running down the entire length=
 of
> the print. These corrugations are easier to feel than to see directly.

I'm having a hard time understanding what you are actually seeing.   So
the pattern goes down the paper not along the head direction?  I'm also
not sure about "very small" and "30-35mm"  which sounds very large.
Is it possible to see it with a scanner, so you could show it?

How you tried other kinds of paper?  I don't think HWM is recommended
for pigment inks -- maybe there's just too much ink for the paper to absorb=
.
Other alternatives are to try different "Image Types" and "Dither Algorithm=
s",
you may get different results.

Roy

> 
> The corrugations are confined to just the printed area.
> They are also slightly deeper where the ink lay-down is heavier.
> Print paper is definitely flat before it's printed.
> I have checked all the other prints made with QTR 2 and found they too ha=
ve
> corrugated the paper in the print area.
> 
> We found that the appearance of 'tonal banding' of the print disappears w=
hen
> the print paper is bent into a strong curve in such a way as to flatten t=
he
> corrugations.
> 
> 
> My guess is there something about the way ink is being laid down by QTR 2=

> that¹s causing the paper to swell in a regular pattern.
> 
> 
> Regards
> Peter Miles
> 
> 
> 
> 
> 
> 
> ##############################
> 
> 
> Message: 22
>    Date: Sun, 02 Nov 2003 03:01:42 -0000
>    From: "candlefarmer" <yahoo@r...>
> Subject: Vertical banding with QTR 2
> 
> >I've recently started experimenting with the Harrington Quadtone RIP v2.=
 I'm
> using the latest beta on an Epson 2200 with the standard Epson inks. Gene=
rally
> the results are outstanding but I continue to have one show-stopper probl=
em:
> vertical banding in dark areas of the print. This seems to be specific to=
 the
> QTR RIP - the same image printed using the epson driver shows no such ban=
ding.
> 
> >It seems to be independent of resolution. I typically use 720x720 but se=
e it in
> higher resolutions also.
> 
> >I originally thought that the banding was due to excessive ink in dark a=
reas. I
> tried lowering the ink limit but the banding remains.
> 
> >I've posted an example here:
> 
> >http://home.comcast.net/~baur/banding.html
> 
> >Is this something others have seen? Any help in taming this would be
> appreciated. (I'm trying to get a couple of things printed for a show and=
 this
> is driving me batty.)