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: Wed, 8 Jan 2020 17:51:04 -0500
You haven't quite got it.
I'm sure of that.
Suppose a sensor is only sensitive to the green portion of the
spectrum. Besides thinking that it's a crumby sensor I would be
tempted to say that it has a limited color gamut. Its range may not
be a "gamut specification" but I'd know what's being said if somebody
told me that that sensor has a limited color gamut.
Isn't the human observer described, plotted or mapped as having a
color gamut? A response to that might be, "no, no, no, the color
gamut is arrived at via post processing in the brain".
Color vision varies from person to person and it isn't only due to
post processing, and I'm guessing that's also the case with cameras.
Add a filter and you change the sensor's output. The word police will
catch up to me but I would say the sensor now has a different color
gamut.
I'm not trying to be difficult on purpose.
Henry Davis
On Jan 8, 2020, at 5:18 PM, Wayne Bretl wrote:
You haven't quite got it. Gamut does not apply to the range of input
spectrum, but to the range of outputs - three tristimulus values and
their
ratios.
If a sensor is blind to wavelengths the eye can see or sensitive to
wavelengths the eye cannot see, that can be used to calculate
colorimetric
error in a particular case of an input spectrum, sensor responses, and
conversion calculations. It is not a gamut specification.
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