Re: Epson Doubleweight Matte
Re: Epson Doubleweight Matte
- Subject: Re: Epson Doubleweight Matte
- From: Graeme Gill via colorsync-users <email@hidden>
- Date: Tue, 25 Jun 2019 10:37:13 +1000
Roger Breton via colorsync-users wrote:
> 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?
Note that OBE's can be composed of multiple elements, FWA being one of them.
Paper manufacturers sometimes also add "shading agents" that alter the
reflectance spectrum in other ways. See
<http://www.axiphos.com/BrightnessReview.pdf>
So there are a range of possible explanations for a paper having an odd
reflectance spectrum.
Cheers,
Graeme Gill.
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