Re: Humans (and cameras and scanners) do not have a color gamut (?)
Re: Humans (and cameras and scanners) do not have a color gamut (?)
- Subject: Re: Humans (and cameras and scanners) do not have a color gamut (?)
- From: Graeme Gill via colorsync-users <email@hidden>
- Date: Thu, 9 Jan 2020 11:24:54 +1100
WAYNE BRETL via colorsync-users wrote:
> Summary: while I agree that sensors do not have a color gamut, they do have a
> signal
> gamut, which inevitably gets translated into a color gamut in any useful
> system.
That's the bottom line - it comes down to how you define "gamut" in the
context of a color transducer.
The conventional definition is that output devices will have colors that
they are unable to reproduce, while input devices have no colors that
they (somehow) can't produce an output for.
A more generalist definition might be based on accuracy. A conventional
output device becomes progressively more inaccurate as it is asked to
output colors beyond its gamut. An input device typically has colors
that it captures inaccurately due to different spectral sensitivities
to a human observer. The latter can't be characterized by a simple
clipping boundary, but if you impose a requirement for a certain
tolerance of color accuracy, then the spectral gamut that an input
device is useful over will be limited.
Note though that a spectral gamut will have no directly corresponding
tri-stimulus gamut, due to the many to one nature of such a conversion.
i.e. for a particular color sensor you may have an example of a spectrum
that it cannot accurately capture, which to a human is a particular color,
but it's probable that there is a different spectrum that appears to be the
same color to a human, that the sensor will capture accurately.
(i.e. it's likely that the 3 dimensional sub-planes of the human
and sensor in spectral space, intersect somewhere.)
By definition humans have no color gamut limitations - anything
we can't perceive, is not a color!
We certainly have a spectral gamut - we only perceive 3 dimensions
out of the possible spectral gamut, and our wavelength range is limited.
Cheers,
Graeme Gill.
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