Henry, I agree, the visible spectrum has a (physical) "limit" but not the camera? No two cameras are likely to have the same response to the spectrum locus. The limit, in this case, is in the "object" being captured -- not in the camera itself. Do you see the difference? / Roger -----Original Message----- From: colorsync-users <colorsync-users-bounces+graxx=videotron.ca@lists.apple.com> On Behalf Of Henry Davis via colorsync-users Sent: Tuesday, January 7, 2020 5:17 PM To: colorsync-users@lists.apple.com Subject: Re: Humans (and cameras and scanners) do not have a color gamut (?) Thanks Roger. What I don’t understand is the idea that the visible spectrum as I understand it has some sort of gamut - it has defined ends. That seems like a gamut to me. Henry Davis
On Jan 7, 2020, at 4:55 PM, Roger Breton via colorsync-users <colorsync-users@lists.apple.com> wrote:
Henry,
I'm not a digital camera designer but what don't you understand about the fact that a camera is a sophisticated "light detection system"? It's pretty much a color measuring instrument (others could correct me) but an i1pro does not have a "gamut" per se or a filter-based colorimeter, they take light in and spit out numbers in response -- same with digital cameras, they take light in and spit out sets of RGB numbers. Surely there's a lot of math going on inside the CPU of a Nikon or a Canon or a SONY camera, like estimation of scene illuminant by which tonal responses are likely adjusted. There may very well be some kind of "model" of various 'natural scenes' because, just like during the creation of output profiles, it helps to have some kind of "assumptions" as to what ranges of colors or luminances are to be expected. But is that a"gamut" per se? A gamut is a physical construct, it comes from something measurable that have "limits".
I hope that helps...
/ Roger
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