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: Wayne Bretl via colorsync-users <email@hidden>
- Date: Wed, 8 Jan 2020 15:18:51 -0700
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.
-----Original Message-----
From: colorsync-users
<colorsync-users-bounces+waynebretl=email@hidden> On Behalf Of
Henry Davis via colorsync-users
Sent: Wednesday, January 08, 2020 3:10 PM
To: email@hidden
Subject: Re: Humans (and cameras and scanners) do not have a color gamut (?)
If the input sensitivity is different for various camera sensors it
makes sense to me if they are compared to each other as "gamuts".
Surely manufacturers describe their sensor's capability - what do they call
it? Maybe range, or dynamic range? But drill one step deeper into the word
"range" and you will find numbers. If all sensors are sensitive beyond
visible light then I can understand that there is no color gamut for sensors
because all sensors would have the same color gamut - that is, all colors.
Entirety(all color) isn't limited, and calling it a "gamut" suggests some
sort of limits. If that's the case then "gamut" would not be the best word
to describe it.
As for numbers . . .
Within the spectrum there is a portion that represents colors of visible
light. The wavelengths of visible colored light start and stop at specific
places(numbers). Are these numbers color, no they are numbers. Regardless,
to my way of thinking that is the "gamut" of visible light within the entire
spectrum. I'm still fussing with myself over that word and its proper use.
Within the entire spectrum visible light has limits. Unlike the sensor
description above, "gamut" would seem like a good word to describe it
because color is limited within the entire spectrum.
Saying that numbers aren't in fact colors seems to contradict the numeric
gamut plot of an output device. An output device's gamut is represented by
numbers. Of course, numbers are not colors - but they represent colors in
both input and output.
Gamut, limits, range - I think any of these words could be used to describe
a sensor's capability and anyone would grasp the subject of the
conversation. Of course, somebody might object to either of these words
being used - depending on their "sensitivity".
Henry Davis
On Jan 8, 2020, at 3:52 PM, Wayne Bretl via colorsync-users wrote:
<Snip>
>
>
> I would add the further note that sometimes the sensor gamut is the
> limiting factor on the final color output, and sometimes the color
> space (e.g. sRGB) is the limiting factor.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden