Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Gerhard Fuernkranz <email@hidden>
- Date: Wed, 05 Jun 2013 23:46:53 +0200
Am 05.06.2013 22:41, schrieb Ben Goren:
Which means that you want them to be rendered into an RGB file not as neutral R=G=B patches (as Bruce Fraser did) but instead as patches with (specific) RGB values very close to each other but not actually equal.
It is not so clear anyway, which absolute color in a scene should be assumed "white" (or "neutral").
Note that chromatic adaptation is a _color appearance_ phenomenon, so strictly it is already beyond colorimetry. Whether an observer really adapts exactly to the color of the illumination source, or to a slightly different color, depends on the particular scene and the particular viewing environment. An outdoors sunset glow scene would IMO not appear so red-ish, if the observer would always adapt completely to the illumination source.
For the pure purpose of carrying out a relative colorimetric transformation, you can basically define/assume any color as "white" (e.g. paper white, or the white patch of a CC, or the illuminant color).
But when the aim is eventually preservation of color appearance, then the assumed source and destination white points should match the actual adapted white points of the observer in the source and destination viewing environment.
Best Regards,
Gerhard
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