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What is the proper way to use 2880 dpi?

What is the proper way to use 2880 dpi?

2005-10-03 by isvibilsky

Hi,

I found that my 2200 printer lays out too much black when I use 2880
dpi resolution. Not sure this is only my printer or it is known fact.
When I printed the ink separation page I was surprised to see the
measured with eye-one values. After 70% black the L value started to
go up. I was not able to build a curve and linearize it in that mode.
However, everything works ok when I use 1440 dpi. Is there a way to
use 2880 dpi? 

Thank you.
Igor
www.photographyforever.com

RE: [QuadtoneRIP] What is the proper way to use 2880 dpi?

2005-10-03 by Stephen Billard

Most of the curves for the 2200 were created to be used at 1440 dpi, this is the
reason your prints don't work so well at 2880. You can try playing with the ink
sliders, or better, just go with 1440.

-Stephen
 www.sbillard.org/Stephen
Show quoted textHide quoted text
> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com 
> [mailto:QuadtoneRIP@yahoogroups.com] On Behalf Of isvibilsky
> Sent: Monday, October 03, 2005 9:15 AM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] What is the proper way to use 2880 dpi?
> 
> 
> Hi,
> 
> I found that my 2200 printer lays out too much black when I 
> use 2880 dpi resolution. Not sure this is only my printer or 
> it is known fact. When I printed the ink separation page I 
> was surprised to see the measured with eye-one values. After 
> 70% black the L value started to go up. I was not able to 
> build a curve and linearize it in that mode. However, 
> everything works ok when I use 1440 dpi. Is there a way to 
> use 2880 dpi? 
> 
> Thank you.
> Igor
> www.photographyforever.com
> 
> 
> 
> 
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RE: [QuadtoneRIP] What is the proper way to use 2880 dpi?

2005-10-03 by Tom Moore

Igor

Clearly one can create 2880 dpi curves for the 2200 because there are some
included in the latest distribution for PC (under the Quad2200-NK7 printing
model). However, when I checked, although the curves were there (.quad
files) the original "source code" for the curves were not (the .qidf files).
I suspect the 2880 curves were created by Inkjet Mall, who did not want to
aid competitors by releasing the .qidf files. Unfortunate, because looking
at other's .qidf files is an excellent way of understanding how curves work.
You could ask on this list or on the BW printing list if any has 2880 curves
for the ink/paper you intend to use.

Unfortunately I haven't made one, although I've made a number of 1440
curves.

I'm not clear what the problem was that you encountered - you said that
after 70% black the L value went up (i.e. density decreased). Perhaps 70% is
a reasonable overall ink limit at 2880 dpi.

You can use curves designed for 1440 at 2880 dpi by reducing the shadows by
about -45% in QTR when you print. I haven't checked the linearity of this
approach, though.

HTH

Tom Moore
Show quoted textHide quoted text
> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of isvibilsky
> Sent: Monday, October 03, 2005 12:15 PM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] What is the proper way to use 2880 dpi?
> 
> Hi,
> 
> I found that my 2200 printer lays out too much black when I use 2880
> dpi resolution. Not sure this is only my printer or it is known fact.
> When I printed the ink separation page I was surprised to see the
> measured with eye-one values. After 70% black the L value started to
> go up. I was not able to build a curve and linearize it in that mode.
> However, everything works ok when I use 1440 dpi. Is there a way to
> use 2880 dpi?
> 
> Thank you.
> Igor
> www.photographyforever.com

Re: What is the proper way to use 2880 dpi?

2005-10-03 by isvibilsky

Tom,

Thank you for the tip. I have tried to reduce the ink limit (-20) for
2880 dpi and ended up with a decent result. It could be just the image
I kept printing for all my testes. 
Regarding the L going up. It seems that excessive amount of inks
creates a glossy look that my spectrometer detects as a higher L
value. I don't use a densitometer. 

I'll search for 2880 profile. I did all my testes using Epson enhanced
matte paper.

Igor.

--- In QuadtoneRIP@yahoogroups.com, "Tom Moore" <r.t.moore@r...> wrote:
> Igor
> 
> Clearly one can create 2880 dpi curves for the 2200 because there
are some
> included in the latest distribution for PC (under the Quad2200-NK7
printing
> model). However, when I checked, although the curves were there (.quad
> files) the original "source code" for the curves were not (the .qidf
files).
> I suspect the 2880 curves were created by Inkjet Mall, who did not
want to
> aid competitors by releasing the .qidf files. Unfortunate, because
looking
> at other's .qidf files is an excellent way of understanding how
curves work.
> You could ask on this list or on the BW printing list if any has
2880 curves
> for the ink/paper you intend to use.
> 
> Unfortunately I haven't made one, although I've made a number of 1440
> curves.
> 
> I'm not clear what the problem was that you encountered - you said that
> after 70% black the L value went up (i.e. density decreased).
Perhaps 70% is
> a reasonable overall ink limit at 2880 dpi.
> 
> You can use curves designed for 1440 at 2880 dpi by reducing the
shadows by
> about -45% in QTR when you print. I haven't checked the linearity of
this
> approach, though.
> 
> HTH
> 
> Tom Moore
> 
> 
> > -----Original Message-----
> > From: QuadtoneRIP@yahoogroups.com
[mailto:QuadtoneRIP@yahoogroups.com] On
Show quoted textHide quoted text
> > Behalf Of isvibilsky
> > Sent: Monday, October 03, 2005 12:15 PM
> > To: QuadtoneRIP@yahoogroups.com
> > Subject: [QuadtoneRIP] What is the proper way to use 2880 dpi?
> > 
> > Hi,
> > 
> > I found that my 2200 printer lays out too much black when I use 2880
> > dpi resolution. Not sure this is only my printer or it is known fact.
> > When I printed the ink separation page I was surprised to see the
> > measured with eye-one values. After 70% black the L value started to
> > go up. I was not able to build a curve and linearize it in that mode.
> > However, everything works ok when I use 1440 dpi. Is there a way to
> > use 2880 dpi?
> > 
> > Thank you.
> > Igor
> > www.photographyforever.com

RE: [QuadtoneRIP] Re: What is the proper way to use 2880 dpi?

2005-10-03 by Tom Moore

Igor

I think you still may be able to create the curve you want.

Using the QTR main window select the curve K7-1440-HanPhotRag as one curve
and select NK7-2880-HanPhotoRag. Right click each curve and display the
curve. You will see how the ink is used for each curve. The difference is
quite striking. Since each curve is for the same ink and paper (I am sure it
is anyway), the difference is due to the BPI chosen. The ink limits for the
K and LK are quite low for the 2880 curve. That's certainly a strong clue
that your measurements of the inkseparation page are correct in indicating a
low black ink limit. It should also be very low for the LK it seems.

By the way, if you're not using a densitometer, how are you measuring L
spectro, scanner?

Tom Moore
Show quoted textHide quoted text
> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of isvibilsky
> Sent: Monday, October 03, 2005 4:18 PM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] Re: What is the proper way to use 2880 dpi?
> 
> Tom,
> 
> Thank you for the tip. I have tried to reduce the ink limit (-20) for
> 2880 dpi and ended up with a decent result. It could be just the image
> I kept printing for all my testes.
> Regarding the L going up. It seems that excessive amount of inks
> creates a glossy look that my spectrometer detects as a higher L
> value. I don't use a densitometer.
> 
> I'll search for 2880 profile. I did all my testes using Epson enhanced
> matte paper.
> 
> Igor.
> 
> --- In QuadtoneRIP@yahoogroups.com, "Tom Moore" <r.t.moore@r...> wrote:
> > Igor
> >
> > Clearly one can create 2880 dpi curves for the 2200 because there
> are some
> > included in the latest distribution for PC (under the Quad2200-NK7
> printing
> > model). However, when I checked, although the curves were there (.quad
> > files) the original "source code" for the curves were not (the .qidf
> files).
> > I suspect the 2880 curves were created by Inkjet Mall, who did not
> want to
> > aid competitors by releasing the .qidf files. Unfortunate, because
> looking
> > at other's .qidf files is an excellent way of understanding how
> curves work.
> > You could ask on this list or on the BW printing list if any has
> 2880 curves
> > for the ink/paper you intend to use.
> >
> > Unfortunately I haven't made one, although I've made a number of 1440
> > curves.
> >
> > I'm not clear what the problem was that you encountered - you said that
> > after 70% black the L value went up (i.e. density decreased).
> Perhaps 70% is
> > a reasonable overall ink limit at 2880 dpi.
> >
> > You can use curves designed for 1440 at 2880 dpi by reducing the
> shadows by
> > about -45% in QTR when you print. I haven't checked the linearity of
> this
> > approach, though.
> >
> > HTH
> >
> > Tom Moore
> >
> >
> > > -----Original Message-----
> > > From: QuadtoneRIP@yahoogroups.com
> [mailto:QuadtoneRIP@yahoogroups.com] On
> > > Behalf Of isvibilsky
> > > Sent: Monday, October 03, 2005 12:15 PM
> > > To: QuadtoneRIP@yahoogroups.com
> > > Subject: [QuadtoneRIP] What is the proper way to use 2880 dpi?
> > >
> > > Hi,
> > >
> > > I found that my 2200 printer lays out too much black when I use 2880
> > > dpi resolution. Not sure this is only my printer or it is known fact.
> > > When I printed the ink separation page I was surprised to see the
> > > measured with eye-one values. After 70% black the L value started to
> > > go up. I was not able to build a curve and linearize it in that mode.
> > > However, everything works ok when I use 1440 dpi. Is there a way to
> > > use 2880 dpi?
> > >
> > > Thank you.
> > > Igor
> > > www.photographyforever.com
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
>

Re: What is the proper way to use 2880 dpi?

2005-10-05 by David Keenan

I too had the problem with too much ink at 2880dpi.

The recommendation of printing at 1440dpi begs the question: Is there any visible advantage of printing at 2880dpi? 

Dave.
-- 
David Keenan, ausdlk@... on 10/5/2005

Re: What is the proper way to use 2880 dpi?

2005-10-27 by koloshor

--- In QuadtoneRIP@yahoogroups.com, David Keenan <ausdlk@s...> wrote:
>
> I too had the problem with too much ink at 2880dpi.

And you should see what happens when the ink load goes too high, i.e.
you're using a curve that adds glop to the midtones and highlights.
 
> The recommendation of printing at 1440dpi begs the question: Is
there any visible advantage of printing at 2880dpi? 

Yes, the images look even less dotty than at 1440 super. 

Caveat: never exceed 100% ink load at 2880. The dither breaks down
under those conditions.

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