Re: basiccolor INPUT
Re: basiccolor INPUT
- Subject: Re: basiccolor INPUT
- From: Graeme Gill <email@hidden>
- Date: Sun, 06 Nov 2011 10:17:29 -0800
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) 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.
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.
[ The choice of the white point has a great influence on
the resulting practical gamut limit. ]
Cameras have many limitations, but gamut is not one of them.
Graeme Gill.
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