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: Florian Höch via colorsync-users <email@hidden>
- Date: Thu, 9 Jan 2020 18:49:09 +0100
Am 09.01.2020 um 18:16 schrieb Henry Davis via colorsync-users:
Speaking about the color gamut of a sensor may not be a precise use
of terms but it does seem to relate a conceptual notion about it.
The problem I have with the term "gamut" when applied to sensors is that
it asserts the notion of a limitation that simply does not exist in the
same way like it does for output devices.
E.g. if a sensor gets saturated, there's two ways around that:
1. Reduce the intensity of what is being measured/captured (when possible)
2. Reduce sensor sensitivity (probably the more practical approach when
it comes to cameras)
Which in turn means, when you try to capture something that is "out of
gamut" (only using the term "gamut" here for the sake of the discussion
topic) for a camera sensor (e.g. at least one channel fully saturated),
you reduce exposure time and/or use a neutral density filter and voila,
you're now able to capture whatever signal was previously clipping.
When it comes to output devices that have color gamuts, there simply is
no equivalent mechanism - e.g. on a computer monitor, you can twiddle
backlight, "contrast", "saturation" controls all you want, once you are
at the hard limit imposed by the panel and backlight, there is no way
to make the gamut any bigger. Same for printers.
TL;DR scenes and output devices have color gamuts, hard limits to the
range of colors they contain or can (re-)produce. Input devices
(sensors) do not (notwithstanding later processing indeed usually
imposing a gamut, at least for cameras, and it certainly is arguable
that cameras where you can only get sRGB or AdobeRGB JPEGs but not raw
capture have an effective gamut limitation due to the latter).
Florian.
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