Digital BW, The Print

Dear List,

Am quite happy with QuadToneRIP neutrality, but what concerns me are the dither 
patterns shipped with GIMP - specifically in the lightest highlights I can see 
significant "roughness" in the dither patterns especially in subtle transistions from 
light grey to lighter grey (e.g. faces)

I have tried most of the resolution media choices and still am not happy with any of 
them.  "1440x720 DPI Four Pass Unidirectional" is the one I think is best of the ones I 
have tested, but still leaves me wishing for a better pattern. 

Anyone else have a problem with the GIMP patterns?

MJS

Michael,

Which printer and inkset are you using?  I'm using the 2200 (currently 
with MIS Ultratones) and the tonal transitions are very smooth, with no 
apparent "roughness".  I was able to see highlight dots in some prints 
when using the UC inks, but just adding the UT light gray solved that 
problem and with the full UT inkset the tones are even better across 
the scale.  Are you using the "Adaptive Hybrid" dither pattern?  That 
one works fine for me at 1440x720 Highest Resolution.  Another dither 
pattern that looks very good is "EvenTone", but it does change the 
overall print tone and I would have to re-profile to correct the tone.

Carl

On Sunday, August 24, 2003, at 03:47  PM, J Michael Sullivan wrote:

> Dear List,
>
> Am quite happy with QuadToneRIP neutrality, but what concerns me are 
> the dither
> patterns shipped with GIMP - specifically in the lightest highlights I 
> can see
> significant "roughness" in the dither patterns especially in subtle 
> transistions from
> light grey to lighter grey (e.g. faces)
>
> I have tried most of the resolution media choices and still am not 
> happy with any of
> them.  "1440x720 DPI Four Pass Unidirectional" is the one I think is 
> best of the ones I
> have tested, but still leaves me wishing for a better pattern.
>
> Anyone else have a problem with the GIMP patterns?
>
> MJS
>

Hi Michael,

As I remember you are using a 9600.  I've done some work with a 7600
and I think I saw what you're calling roughness.  I don't think its the dither
pattern but instead it's the ink droplet size.

I've been looking at the printer documentation and it appears that there is
an even smaller droplet size available.  The version of gimp-print I'm using
doesn't support that a later version does.  So I'm going to try and retrofit
that small droplet size into the gimp-print I'm using.

I have a short timeslot to try this on the 7600 this coming week.  If the
simple fix works, I can make it available very soon -- but if I need to
upgrade the whole gimp-print version it'll take longer.

Roy

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl Schofield <scho@m...> 
wrote:

> Michael,
> 
> Which printer and inkset are you using?  I'm using the 2200 (currently 
> with MIS Ultratones) and the tonal transitions are very smooth, with no 
> apparent "roughness".  I was able to see highlight dots in some prints 
> when using the UC inks, but just adding the UT light gray solved that 
> problem and with the full UT inkset the tones are even better across 
> the scale.  Are you using the "Adaptive Hybrid" dither pattern?  That 
> one works fine for me at 1440x720 Highest Resolution.  Another dither 
> pattern that looks very good is "EvenTone", but it does change the 
> overall print tone and I would have to re-profile to correct the tone.
> 
> Carl
> On Sunday, August 24, 2003, at 03:47  PM, J Michael Sullivan wrote:
> 
> > Dear List,
> >
> > Am quite happy with QuadToneRIP neutrality, but what concerns me are 
> > the dither
> > patterns shipped with GIMP - specifically in the lightest highlights I 
> > can see
> > significant "roughness" in the dither patterns especially in subtle 
> > transistions from
> > light grey to lighter grey (e.g. faces)
> >
> > I have tried most of the resolution media choices and still am not 
> > happy with any of
> > them.  "1440x720 DPI Four Pass Unidirectional" is the one I think is 
> > best of the ones I
> > have tested, but still leaves me wishing for a better pattern.
> >
> > Anyone else have a problem with the GIMP patterns?
> >
> > MJS
> >

In a message dated 8/24/03 3:56:06 PM, michael@... writes:


> Dear List,
> 
> Am quite happy with QuadToneRIP neutrality, but what concerns me are the 
> dither 
> patterns shipped with GIMP - specifically in the lightest highlights I can 
> see 
> significant "roughness" in the dither patterns especially in subtle 
> transistions from 
> light grey to lighter grey (e.g. faces)
> 
> I have tried most of the resolution media choices and still am not happy 
> with any of 
> them.  "1440x720 DPI Four Pass Unidirectional" is the one I think is best of 
> the ones I 
> have tested, but still leaves me wishing for a better pattern. 
> 
> Anyone else have a problem with the GIMP patterns?
> 
Hi Michael;

Have you done the full head alignment routine on the same paper that you 
usually print on? It takes about 20 minutes and requires a loupe for the vertical 
line segments. That might get things into better shape.

All the best!

Andrew Darlow


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