Re: The gamut of digital capture
Re: The gamut of digital capture
- Subject: Re: The gamut of digital capture
- From: Ray Maxwell <email@hidden>
- Date: Wed, 11 Jan 2006 12:24:11 -0800
I will also try to be gentle.
CCD and CMOS input chips will output RGB data from input well outside
what humans can see. Even with an IR cutoff filter your camera will
respond to electromagnetic radiation well outside the visible range.
Try the following experiment.
Pick up your TV remote control. Press one of the buttons and look at
the output of the LED. Do you see anything?
Now hold down the button and take your digital SLR and take a picture of
the remote control. Make sure you use a slow shutter speed. The signal
is flashing on and off. You can also try this with a video camera.
Now let me ask you a question. Is the IR from the remote control inside
the sRGB color space?
For a fixed light setup and a given set of pigments it is possible to
profile this setup and copy art work with reasonable accuracy. All
other forms of digital photography and film photography are abstract
renderings of reality. They do not create "accurate" color. With the
proper profiles they can produce pleasing color.
Go to the original data sheets for any CCD or CMOS array and look at the
quantum efficiency plots. After looking at this, do you really think
the chip does not respond to any radiation outside the sRGB color space?
Here is a URL where you can download the data sheets on Dalsa chips used
in the high end digital backs like Leaf:
http://www.dalsa.com/pi/documents/documents.asp
In God we trust...All others have to show us the data!
The typical DSLR will respond to colors outside the sRGB color space.
You can talk about the gamut of a printer, monitor, or scanner with a
certain film emulsion, however, when you talk about a camera exposed to
electromagnetic radiation outdoors, you are treading on thin ice. It is
not that simple.
Ray
Andrew Rodney wrote:
I found this ³interesting² and thought I¹d see what others think of this
statement:
by WILL CROCKETT UPDATED January, 2006.
The so called "native" color space, meaning the volume of color that all
DSLR's can actually record is very close to the sRGB space - certainly
smaller than Adobe RGB. When you set a DSLR to capture in the Adobe RGB
space, it doesn't capture more color at all. In fact, it just uses the same
color info and stretches it out into the Adobe RGB space, and struggles to
do so.
The entire piece is here (you need to make a free account and log in):
http://shootsmarter.com/infocenter/wc003.html
A link goes to a page that also states:
FACT ONE: there are no printers with a color space (aka output space) that
is larger (holding more volume of data) than sRGB.
Andrew Rodney
http://www.digitaldog.net/
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