Re: Epson Stylus Pro 9600 Extrachrome
Re: Epson Stylus Pro 9600 Extrachrome
- Subject: Re: Epson Stylus Pro 9600 Extrachrome
- From: Robin Myers <email@hidden>
- Date: Wed, 17 Nov 2004 12:59:52 -0800
On 17 Nov 2004, at 12:44, Steve Upton wrote:
At 10:23 AM -0800 11/17/04, Graeme Gill wrote:
Roger Breton wrote:
What would you call then a reflective surface that
'disproportionatly' or
wildy change its appearance with two different light sources?
I'm not sure anyone has invented a word for that ! It depends of
course
on the nature of the three spectrum involved. I could certainly
imagine
designing three spectrum (the reflective surface and the two light
sources)
such that the color appeared to change radically, even if the two
light
sources appear "white" when viewed directly.
I don't think there is a term for this exactly. I use the terms "gray
balance failure" or "color balance failure" when talking about this.
Technically it's not metamerism because there are not two samples. But
the physics behind it is the same.
The technical term for the phenomenon where a single sample appears to
change color with a change in illuminant is "color inconstancy". There
is a calculation for it described in Berns' book "Billmeyer and
Saltzman's Principles of Color Technology, Third Edition". The quantity
is called the Color Inconstancy Index or CII.
SpectraShop can calculate several different CII values for a sample.
Robin Myers
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