[argyllcms] Re: Determining paper color from a profile?
- From: Ben Goren <ben@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 2 Feb 2010 19:16:20 -0700
On 2010 Feb 2, at 6:37 PM, Klaus Karcher wrote:
> Graeme's method to estimate FWA amount is very elegant IMHO: he
> uses the curve shape as measure (UV absorption and blue
> remission of the FWAs cause a typical curve shape) -- but of
> course you need spectral data and it's still a estimation
> (albeit a much better estimation than tristimulus values).
Since I wrote that last email I rememberd that the printer came
with a swatch book of Canon papers. So, I've just spent a bunch of
time running through the book with my i1, and I now know *exactly*
what to look for. Papers with FWA have a very distinctive shoulder
on the left side of the plot.
For example, here's Canon's Fine Art Natural:
And their Fine Art Bright White:
I had started to get excited over the Hahnemuhle Photo Rag sample
in the book, which measures at D50 Lab: 97.008566 0.533525
0.264654. But, as you can see, it does actually have a bit of FWA
(though not a whole lot, to be sure):
So, I'm now going back through the book, this time with spotread
-S, looking for the best paper without any FWA....
Cheers,
b&
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