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: Henry Davis via colorsync-users <email@hidden>
- Date: Thu, 9 Jan 2020 22:29:52 -0500
Graeme, there's a lot more in what you say than I can grasp - but a
little is trying to creep thru. I'll be thinking about this.
Maybe the concept, or my concept, of 'gamut' is broader than what can
be allowed in this discussion. I'm ok with that. 'Gamut' for me
isn't quite so neat, it's more conceptual than precise - but I do
think of it as having some sort of 'bounding'.
Thanks, I don't want to beat this horse as much as some may think I do
but I can't help myself sometimes when it comes to conceptual
hurdles. This thread has hit upon some subjects that have always
triggered my imagination.
Henry Davis
On Jan 9, 2020, at 6:07 PM, Graeme Gill via colorsync-users wrote:
Henry Davis via colorsync-users wrote:
Does a 'colorblind' human have a diminished gamut with regard to
his input 'devices'?
As before, it comes down to your definition of "gamut". For a
Protanope/Deuteranope/Tritanope observer, their spectral gamut is one
whole dimension less than most humans.
A two channel sensor certainly can't distinguish a full range
of color (where "color" means a normal human observers perception
of light). But this range can't be characterized by a neat bounding
box in tri-stimulus space called a "gamut".
It can only be characterized by an accuracy limit boundary drawn in
spectral space, that is a property of both the sensor itself, and
whatever mechanism (i.e. profile) used to convert the sensor signals
into color values.
It's unlikely that there is a corresponding 3 dimensional color
volume, since the dimensionality of the spectral space is much
higher, making a 1:1 mapping topologically impossible. The
best you could do is color + extra dimensions. i.e. a particular
color may be out of gamut when it has one spectral composition,
but in gamut when it has another. The spectral composition
forms the extra dimensions of such a "color gamut" representation.
Cheers,
Graeme Gill.
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