Re: basiccolor INPUT
Re: basiccolor INPUT
- Subject: Re: basiccolor INPUT
- From: José Ángel Bueno García <email@hidden>
- Date: Sun, 06 Nov 2011 18:45:16 +0000
Hello Graeme:
2011/11/6 Graeme Gill <email@hidden>:
> José Ángel Bueno García wrote:
>
>>> Input devices that let you adjust the exposure don't have
>>> a color gamut. You can capture any color simply by adjusting
>>> the exposure so as not to overload the sensors.
>>
>> That is, for me, difficult to understand.
>
> There are many ways of explaining the same thing, but the
> above is pretty straightforward. You reach a gamut limit
> when some signal reaches a limit. For an output device
> (say a monitor)
When I make this statement in photographic sites, "monitor as output
device" coleagues looks to me like I were crazy. Anecdote.
your reach the limit when the voltage
> or digital representation reaches its limit. You
> can't get any more red in the red channel than
> when it is at 100%. That's a physical limitation
> of the output device. There are no such limits on
> something like a camera. If the red signal overloads
> the red sensor, simply turn the exposure down.
Well, is the same in the human visual sistem and response of rods in
photopic condition. But, is there difference in the way/sense of
digital-analog signal conversion?
>
> The ultimate gamut boundary is to run a monochromatic
> source (ie, laser) across all visible wavelengths. As
> long as the laser intensity does not overload the camera
> sensor, the camera will capture 100% of the visible
> gamut. You will have gamut limits when/if you try
> and convert this to an output referred colorspace,
> but that is not a camera limitation.
I'm not familiar with this technology and is hard to understand, for
me, that monochromatic laser light source don't overload the sensor no
matter what filter is previous to photosites.
>
> [ The choice of the white point has a great influence on
> the resulting practical gamut limit. ]
Agree. But you say practical gamut limit. I supose that you mean gamut
limit of a display because you refer white point.
>
> Cameras have many limitations, but gamut is not one of them.
Humm. http://www.color.org/documents/CaptureColorAnalysisGamuts.pdf
>
> Graeme Gill.
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