Re: On the color of printed Cyan ink in North America
Re: On the color of printed Cyan ink in North America
- Subject: Re: On the color of printed Cyan ink in North America
- From: Roger Breton <email@hidden>
- Date: Sat, 30 Oct 2004 14:37:13 -0400
Mike, Hank and Abe,
I've compiled a few representative cyans which I list below in Lch :
L c h
========|========================================
56 59 233 | Matchprint Commercial base (measured with ICcolor by me)
55 58 236 | US Web printer Coated Stoch (measured with ICcolor)
57 59 235 | ColorArt on Supreme Gloss Coated (measured with ICcolor
56 57 227 | ANSI CGATS TR-001: 1995 (aka US WebCoated SWOP v2)
58 60 230 | US Sheefed Coated v2 (Adobe Photoshop based on Matchprint)
58 59 230 | US SpeedMaster VP74 printed on gloss coated
57 62 232 | Dupont Waterproof (measured with EyeOnePro)
58 59 235 | Mitsubishi Sheetfed on European Gloss Coated (x41uv)
50 57 232 | ManRoland 200 Sheetfed on European Gloss Coated
56 46 221 | SpeedMaster sheetfed on European Gloss Coated
56 56 236 | RIT SpeedMaster VP7 on LustroLux Gloss Coated (1999)
57 61 236 | Dupont Cromalin (www.thetascan.com france)
60 63 229 | Matchprint Commercial base (www.lithoacme.com Montreal)
56 52 228 | SWOP Certified Press Sheet on Champion Textweb #5
I have the impressin that 235 cyan inks uses a lower quality pigment? Maybe
it's just an impression. But in view of ISO-12647 and ISO-2846-1, that hue
angle cannot be ignored.
It could be that the cyans measuring lower than 230 are affected by the
quality of the paper color? Champion Textweb is definitely on the yellow
side of the equation. So that could be a factor. But when I look at your
example below, Mike, seeing that you have a paper with a b* of -4.70, whish
is relatively blue, and yet you get a quite hue of 232 degrees, I have to
wonder to what extent can the hue be entirely attributable to the shade of
the paper? (If I had the choice, I send you my jobs, btw) Now, when I look
at a Matchprint laminated on Commercial base, the shade of paper tends to be
on the yellow side (96 0 2.6). Maybe there is a relation between the shade
of the paper and the hue angle of cyans? I just don't have enough data to
analyze it. But I don't believe so. I think it's a function of ink
formulation and the choice of phtalocyanin pigments.
Anybody got one of the new SWOP Certified Press sheets on Monterey Gloss?
What is the cyan hue angle?
> We recently changed ink, so I had the manufacturer confirm Iso2846-1
> compliance. Hue angle of the sample I have is 227. After reading your
> e-mail I measured a press sheet...cyan at target density of 1.37 and got
> a hue angle of 232. I attribute this to paper I suppose.
>
> I notice in the ISO spec that came with the ink samples the paper
> substrate values are:L* 95.46, a*-0.40, and b* 4.70 with no optical
> brighteners. That b* value jumps out at me now. Do you happen to know if
> that is accurate?
>
> mike
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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