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: Iliah Borg via colorsync-users <email@hidden>
- Date: Wed, 8 Jan 2020 12:08:21 -0500
On Jan 8, 2020, at 11:44 AM, WAYNE BRETL via colorsync-users wrote:
> Summary: while I agree that sensors do not have a color gamut, they do have a
> signal gamut, which inevitably gets translated into a color gamut in any
> useful system.
Ut queant laxis resonare fibris
Mira gestorum famuli tuorum,
Solve pollutis labiis reatum,
Sancte Iohannes.
Please allow me some thoughts here.
The question is what do we mean by gamut? A complete range? In that case, for
any signal it's trivial that it has "gamut", right?
IMHO it is less trivial that different colours can be mapped to the same output
signal, or same colour - to different output signal, leading to metameric error.
When shooting a rainbow using some relatively early sensors, some colours were
rendered as black by in-camera JPEG engines, but they were never at zero on the
raw (signal) level, and the actual levels were significantly higher than noise.
When dealing with renderings, it is possible to mistake mapping problems for
CFA/sensor problems.
Most of the SRF I've seen published are not very accurate, so using synthesis
from SRFs to analyze sensor behavior isn't all that straightforward.
--
Best regards,
Iliah Borg
LibRaw, LLC
www.libraw.org
www.rawdigger.com
www.fastrawviewer.com
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