Digital BW, The Print

More than a 100 papers are measured with a spectrometer to reveal what
makes them white.
A page explains how they are measured and what the measurement's
spectral plots can tell.

http://www.pigment-print.com/spectralplots/spectrumviz_1.htm

-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

|      Dinkla Grafische Techniek      |
|         www.pigment-print.com        |
|                 ( unvollendet )                 |

Hi Ernst. What a great effort you've put into this. Thank you.
Just a quick question if I may. I caught your post relating to the Teflon rolls on the other group and I wondered if you have curves for them using your Spectrolino/spectroscan(?) available as well as those from the i1 that you show in the posted data here. Do you think that the new spectro is less sensitive at the 400nm end of the scale or does it show similar results as your other instruments?

Your work is going to be very useful to all of us.
Thanks again, both to you and to your son.
Regards,
Duane


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla <edinkla@...> wrote:

>
> More than a 100 papers are measured with a spectrometer to reveal what
> makes them white.
> A page explains how they are measured and what the measurement's
> spectral plots can tell.
> 
> http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
> 
> -- 
> Met vriendelijke groeten,   Ernst
> 
> Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/
> 
> |      Dinkla Grafische Techniek      |
> |         www.pigment-print.com        |
> |                 ( unvollendet )                 |
>

dlruckus schreef:
> Hi Ernst. What a great effort you've put into this. Thank you.
> Just a quick question if I may. I caught your post relating to the Teflon rolls on the other group and I wondered if you have curves for them using your Spectrolino/spectroscan(?) available as well as those from the i1 that you show in the posted data here. Do you think that the new spectro is less sensitive at the 400nm end of the scale or does it show similar results as your other instruments?
> 
> Your work is going to be very useful to all of us.
> Thanks again, both to you and to your son.
> Regards,
> Duane

It all started with a discussion some time ago on this forum about the 
different white readings of Canson Rag Photographique.
I didn't trust the Spectrocam anymore and it is an old one meanwhile. So 
I got the new Eye ! Basic and did the paper measurements again. 
Meanwhile I have seen lots of discussions on Spectro- Colorimeter 
measurements here, on DPreview forums etc and I think the deviations of 
the Spectrocam were not that bad either. I plan to add its readings of 
Teflon on another page than the paper white page to reduce confusion.

The Spectrocam still has some nice features, the flash light source 
allows faster sampling than the Eye 1, if I pull it over a paper it will 
take up to 30 samplings per patch if I recall it correctly and give an 
average  result. The light source is closer to daylight. It will read a 
slightly wider spectrum. It is no longer available in the market so this 
is not so relevant anymore.

-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

|      Dinkla Grafische Techniek      |
|         www.pigment-print.com        |
|                 ( unvollendet )                 |

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla <edinkla@...> wrote:
>
...
> The Spectrocam still has some nice features...  ...It is no longer available in the market so this 
> is not so relevant anymore.
> 

yeah, mine's gathering dust on in the back room, somehow putting it in a garbage can just seems wrong...
Tyler

I will look forward to seeing them. I too have the same sense that you get about the deviations of readings for the different spectros. From what I can learn, it appears that a fair number of the recent and currently available instruments might actually plug in assumed values from about 420nm on down using a variety of proprietary undocumented magic numbers.
I'm personally very interested in the extended readings you may have.The instruments I currently use are all from x-rite and are all intentionally limited to the 400-700nm range. I'd like to get around that limitation at some point and have some plans to do so.

Regards,
Duane


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla <edinkla@...> wrote:

> 
> It all started with a discussion some time ago on this forum about the 
> different white readings of Canson Rag Photographique.
> I didn't trust the Spectrocam anymore and it is an old one meanwhile. So 
> I got the new Eye ! Basic and did the paper measurements again. 
> Meanwhile I have seen lots of discussions on Spectro- Colorimeter 
> measurements here, on DPreview forums etc and I think the deviations of 
> the Spectrocam were not that bad either. I plan to add its readings of 
> Teflon on another page than the paper white page to reduce confusion.
> 
> The Spectrocam still has some nice features, the flash light source 
> allows faster sampling than the Eye 1, if I pull it over a paper it will 
> take up to 30 samplings per patch if I recall it correctly and give an 
> average  result. The light source is closer to daylight. It will read a 
> slightly wider spectrum. It is no longer available in the market so this 
> is not so relevant anymore.
> 
> -- 
> Met vriendelijke groeten,   Ernst
> 
> Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/
> 
> |      Dinkla Grafische Techniek      |
> |         www.pigment-print.com        |
> |                 ( unvollendet )                 |
>

Oh! Don't do that Tyler.I have a fondness for resuscitating old things. If you ever find yourself wavering let me know. I'll be happy to find a place for it on a back shelf of my own where I might even be willing to bow to the spectro gods and give it homage on occasion ;)

Duane


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "tboleyyh" <tyler@...> wrote:

>
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla <edinkla@> wrote:
> >
> ...
> > The Spectrocam still has some nice features...  ...It is no longer available in the market so this 
> > is not so relevant anymore.
> > 
> 
> yeah, mine's gathering dust on in the back room, somehow putting it in a garbage can just seems wrong...
> Tyler
>

dlruckus schreef:
> I will look forward to seeing them. I too have the same sense that
> you get about the deviations of readings for the different spectros.
> From what I can learn, it appears that a fair number of the recent
> and currently available instruments might actually plug in assumed
> values from about 420nm on down using a variety of proprietary
> undocumented magic numbers. I'm personally very interested in the
> extended readings you may have.The instruments I currently use are
> all from x-rite and are all intentionally limited to the 400-700nm
> range. I'd like to get around that limitation at some point and have
> some plans to do so.
> 
> Regards, Duane

There's this paper that I tried to read properly this afternoon::

http://www.color.org/ICC_white_paper_22_Precision_and_Bias_in_Measurement.pdf

No mention of brands though but I see deviations that go beyond the 
specs you get with the instruments.


-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

|      Dinkla Grafische Techniek      |
|         www.pigment-print.com        |
|                 ( unvollendet )                 |