Re: basiccolor INPUT
Re: basiccolor INPUT
- Subject: Re: basiccolor INPUT
- From: MARK SEGAL <email@hidden>
- Date: Sun, 06 Nov 2011 10:46:46 -0800 (PST)
<<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.>>
Graeme,
If the red signal overloads the red sensor is that not a limitation? Doesn't word "overload" imply that the thing being "overloaded" has reached a limit?
Mark
________________________________
From: Graeme Gill <email@hidden>
To: ColorSync <email@hidden>
Sent: Sunday, November 6, 2011 1:17:29 PM
Subject: Re: basiccolor INPUT
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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