Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Ben Goren <email@hidden>
- Date: Wed, 05 Jun 2013 12:53:59 -0700
On Jun 5, 2013, at 12:41 PM, Robin Myers <email@hidden> wrote:
> Since the RGB values of a chart image defines a sampling in RGB space, and when using a color chart the neutral patches are used by color engineers to represent the RGB space's neutral axis, then the chart neutral patches can be envisioned as a sampling of the neutral axis.
I'm with you on that, but then we come back to your statement that caused me the confusion in the first place:
>>> In the case of the pigments used in the ColorChecker family, the neutral axis is skewed in XYZ space slightly from that of the illuminant, D50 (the Prophoto RGB white point).
I think we're agreed that the illuminant and chart neutral axes are synonymous, and that the chart may have patches that lie very close to but aren't actually on the neutral axis.
So...without me putting words in your fingers, could you help clarify what you mean by the ColorChecker neutral axis being skewed from the D50 neutral axis?
Thanks,
b&
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