RE: Epson Doubleweight Matte
RE: Epson Doubleweight Matte
- Subject: RE: Epson Doubleweight Matte
- From: Roger Breton via colorsync-users <email@hidden>
- Date: Mon, 24 Jun 2019 07:32:52 -0400
Ernst,
This “phenomenon” of some optically brightened paper having a higher a*
component is a mystery to me. To your knowledge, is it simply a function of
having added a lot of FWA to the substrate, during the manufacturing process?
Such that, as more and more FWA is added, a* simply becomes progressively more
positive? Turning into “redder” appearance, visually, at some point?
I confess don’t know enough of the behavior of stilbene and other FWA added to
inkjet medias, personally, but my hypothesis is that all substrates – inkjets
or not – are made up of the SAME FWA, I can’t say whether different FWAs are
used, industrially, in the fabrication process? The thought would have never
crossed my mind that different FWAs are used for different papers.
I seem to recall that papers with a lower b* value like those used in coated
offset papers, like -3.00 or -4.00, rarely get positive a* values? They’re
always around 0.50 or 0.60, usually quite low, and hence never appear
“reddish”.
I’ll have to check on the Fogra 52 data… (The plot thickens…)
Best / Roger
From: Ernst Dinkla <email@hidden>
Sent: Monday, June 24, 2019 3:32 AM
To: email@hidden
Cc: 'colorsync-users?lists.apple.com' List <email@hidden>
Subject: Re: Epson Doubleweight Matte
Roger,
However you will see that effect in the Hahnemühle Baryta FB 350, a magenta
cast, that is the result of OBA blue emission + red reflection and little
green+yellow contributing to the paper white. Chromatic adaption can not cope
with it. Epson Double Weight Matte paper has a similar spectral plot but less
pronounced.
Met vriendelijke groet, Ernst
Dinkla Grafische Techniek
Quad, piëzografie, giclée
www.pigment-print.com <http://www.pigment-print.com>
On Sun, Jun 23, 2019 at 6:48 PM Roger Breton via colorsync-users
<email@hidden <mailto:email@hidden> >
wrote:
Finally got hold of a fresh sample of Epson Doubleweight Matte paper.
Here is a link to its measurements, in Excel.
https://1drv.ms/x/s!AkD78CVR1NBqkLVN8r7LgHiGqxRYZg
In M1 mode, I believe it's going to be sufficient to carry my humble color
separations experiments :
CIE Lab D50/2 (KonicaMinolta FD-7)
93.86
2.53
-8.01
Thank you all for your kind and patient help / Roger
P.S. "Funny", this paper appears to have a slightly "reddish" tint. Of
course, it does not appear "reddish" to me, because of chromatic adaptation,
no matter what lighting I observe it under.
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