FW: Humans (and cameras and scanners) do not have a color gamut (?)
FW: Humans (and cameras and scanners) do not have a color gamut (?)
- Subject: FW: Humans (and cameras and scanners) do not have a color gamut (?)
- From: Wayne Bretl via colorsync-users <email@hidden>
- Date: Wed, 8 Jan 2020 14:21:30 -0700
Arrgh - addressing problems - went only to iliah and not the whole list as
intended
-----Original Message-----
From: Wayne Bretl <email@hidden>
Sent: Wednesday, January 08, 2020 2:13 PM
To: 'Iliah Borg' <email@hidden>
Subject: RE: Humans (and cameras and scanners) do not have a color gamut (?)
See Jack Holm's paper, which I posted above, where he derives the spectral
locus of a combination of a sensor's outputs and a subsequent matrix:
http://www.color.org/documents/CaptureColorAnalysisGamuts.pdf
Although he does not show the sensor outputs themselves, they have reached
their extreme possible ratios when the stimulus is a single wavelength, and
therefore a pseudo chromaticity chart could be plotted using the ratios of
one channel to the sum of the three on one axis and a ratio of a second
channel to the sum on the orthogonal axis. This chart would have a defined
gamut of sensor values (inside the spectrum locus) but would not represent
colors per se until processed through a matrix.
Holm shows the resulting chromaticities for multiple sensors and several
reasonable matrices. He includes cases for motion picture negative film that
clearly show a triangular gamut limit (spectral locus).
-----Original Message-----
From: Iliah Borg <email@hidden>
Sent: Wednesday, January 08, 2020 1:59 PM
To: Wayne Bretl <email@hidden>
Cc: Andrew Rodney <email@hidden>; Andrew Rodney via colorsync-users
<email@hidden>
Subject: Re: Humans (and cameras and scanners) do not have a color gamut (?)
On Jan 8, 2020, at 3:52 PM, Wayne Bretl via colorsync-users wrote:
> .
> The discussion has moved beyond the true but uninformative statement
> that cameras (sensors to be precise) do not have a color gamut , to
> considering how the gamut of sensor outputs
I would very much like a definition here. What is the gamut of sensor
outputs?
And of course, how to measure it?
--
Best regards,
Iliah Borg
LibRaw, LLC
www.libraw.org
www.rawdigger.com
www.fastrawviewer.com
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