RE: Color inconstancy index (was Epson 2200 inks)
RE: Color inconstancy index (was Epson 2200 inks)
- Subject: RE: Color inconstancy index (was Epson 2200 inks)
- From: "Steve Lawrence" <email@hidden>
- Date: Mon, 19 Jan 2004 11:44:11 -0000
- Thread-topic: Color inconstancy index (was Epson 2200 inks)
Roger Breton wrote:
>
what I believe I'm after is something called "Color Constancy Index",
[snip]
>
The concept I meant to use above was "Color Inconstancy
>
Index" and not "Color Constancy Index" which has to do with
>
chromatic adaptation.
Yes, there is a colour quality metric called the Color Inconstancy
Index. Roy Berns describes both a simplified and more rigorous version
of the index in detail in Principles of Color Technology. I've found the
metric useful. It's a great book and contains more valuable
practical/background advice than some of the standard texts. If you buy
it check the errata on his website.
There is also a version in Hunt's Measuring Colour but I don't recall it
too clearly.
>
How can the two sample colors
>
be compared directly? By converting sample A tristimulus
>
values to D65 illuminant through chromatic adaptation. Then
>
any color difference equation can be used to calculate the
>
'Color Inconstancy Index' between the two samples.
Yes, the rigorous version Berns describes works in a similar way, but
beware of his warning that the chromatic adaptation transform does not
take into account colour constancy...
Regards,
Steve Lawrence
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