Re: Get density values from spectral color?????
Re: Get density values from spectral color?????
- Subject: Re: Get density values from spectral color?????
- From: Graeme Gill <email@hidden>
- Date: Wed, 11 Feb 2004 11:23:46 +1100
- Organization: Color Technology Systems
Terence L. Wyse wrote:
I think you need ISO 5-3 (link: http://www.i3a.org/wg21.html). It will
have formulas to convert spectral power distribution to Status T/E/M/A
or whatever. Beware, the formulas are not for the faint of heart or weak
of stomach, at least when I looked at the formulas with my 6th grade
math eyes! :-) A couple of years ago, I set out to use these formulas
with a Spectrolino and Eye-One but grew weary of the math involved.
It's not that bad ! They are only spectral weighting curves, just like
the XYZ standard observer curves. The only thing to watch out for, is
that the standard lists the weights as log values, rather than the sorts
of linear weightings the standard observer is documented as.
It's all just the usual "multiply each spectral band value by its weighting,
sum the result, divide by the scaling factor" stuff.
Graeme Gill.
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