Re: Epson Stylus Pro 9600 Extrachrome
Re: Epson Stylus Pro 9600 Extrachrome
- Subject: Re: Epson Stylus Pro 9600 Extrachrome
- From: Roger Breton <email@hidden>
- Date: Wed, 17 Nov 2004 08:24:00 -0500
Graeme Gill wrote:
> Metamerism is when two stimuli have
> different spectrum, but appear the same color.
OK. Two surfaces featuring dissimilar spectral reflectances appearing the
same under a given illuminant but not under all illuminants is a metameric
match. A spectral match is when two surfaces feature the same spectral
reflectances. Then, of course, they will match under any illuminants.
> If you illuminate a
> reflective surface with two different light sources, it would be
> unusual if the resulting reflected spectrum didn't change in appearance.
What would you call then a reflective surface that 'disproportionatly' or
wildy change its appearance with two different light sources? I am talking
about an Epson 1280 print, on Epson glossy paper, that looks one way under
5000K, another way (yet recognizably the same) under tungsten but radically
different, all of a sudden, for no apparent readon, under window light? As
though you'd be viewing the print through a green filter.
There must be a way to operationalize the color appearance of the print
under various light sources. But I have no idea what it is. In principle,
the change in appearance of the print is predicted by simply integrating
using a different relative illuminant spectra. But I submit this technique
fails here because of some combination of Epson inks and substrate.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden