[argyllcms] Re: Metameric Mismatch
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 13 Oct 2014 17:22:04 +1100
Brad Funkhouser wrote:
> So, is there any realistic way to approximate my camera's spectral response
> curves? Can some fancy color science math utility take RGB values for a
> measured ptfe white patch shot under 4 or 5 significantly different measured
> illuminants and somehow glean a close approximation? If this is possible,
> is there a utility to feed D50 spectral color data through an illuminant
> then through a set of response curves to get expected RGB values?
Hi,
such things have been done, but the problem tends to be
under-constrained,
so a lot of assumptions need to be made, resulting in curves that are often
quite sensitive to measurement noise and not very accurate overall.
To get greater accuracy you really need a target with finely spaced
transitions throughout the wavelength range.
I have had a play with some code that does this, using the i1d3
spectral sensitivities as an example "ground truth" set, but something
like the ColorCheckerDC really doesn't seem to have the range of spectral
shapes to give dependable real world results.
Graeme Gill.
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