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: Tue, 7 Jan 2020 16:51:42 -0500
Let's start with this:
Cameras record measurements of light, according to some function one can call
"camera observer" or spectral response functions. That's not human observer,
and thus it's not colour. More, there is no one-to-one transform from camera
observer to human observer.
The closer the transform from camera observer to human observer is to
one-to-one, the easier it is to speak of "colour accuracy".
Next:
The term gamut is applicable to output devices. Cameras and scanners are input
devices.
On Jan 7, 2020, at 4:45 PM, Henry Davis via colorsync-users wrote:
> When the “cameras absolutely do not have gamuts” quote moves from “some
> response” of a camera to “color accuracy” I get lost. It sounds as though
> there is a ruler(the display) measuring a non-dimensional entity for accuracy.
>
> The quote seems to assume that the camera has infinite perfection but it’s up
> to some mysterious other entity to prove that it doesn’t have infinite
> perfection.
>
> I’m now losing my fight to understand - I was pretty much following the
> previous threads about the distinction between color and numbers but this
> curve ball has me swinging and missing. I believe the quote was supposed to
> bring some clarity but it didn’t work for me. Maybe there’s another way to
> explain not having a gamut that will help.
>
> Henry Davis
>
>> On Jan 7, 2020, at 3:56 PM, Andrew Rodney via colorsync-users
>> <email@hidden> wrote:
> <Snip>
>>
>> Further (and getting back to Fairchild), I asked this question directly to
>> Mark D. Fairchild from RIT and I just would like to share his answer here:
>>
>> “This one is easy for me … cameras absolutely do not have gamuts.
>
>> . . . I can put any visible stimulus in front of any camera (that responds
>> to visible light) and I will get some response. How that response is
>> rendered to a display has an impact on the quality and color accuracy of the
>> camera, but it in no way creates a gamut (only the display or some arbitrary
>> limitation of the display . . .
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--
Best regards,
Iliah Borg
LibRaw, LLC
www.libraw.org
www.rawdigger.com
www.fastrawviewer.com
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