Re: Colorsync-users Digest, Vol 2, Issue 506
Re: Colorsync-users Digest, Vol 2, Issue 506
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 506
- From: David Scharf <email@hidden>
- Date: Wed, 21 Dec 2005 16:16:54 -0800
By definition, the signal to noise ratio is never improved by
decreasing the signal.
Regards,
David
DAVID SCHARF PHOTOGRAPHY
Scanning Electron Microscopy
Phone 323-666-8657
Fax 323-666-0449
2100 Loma Vista Place
Los Angeles, CA 90039
http://www.scharfphoto.com
http://www.electronmicro.com
Ray Maxwell wrote:
Stefan
Steib wrote:
The only way to get over this is to use a
blue compensation filter for
tungsten
Do you have any examples of this practice improving the s/n ratio
significantly?
Now let us reason together...
1. A filter cannot add any signal or increase the light that comes
into the camera.
2. I suggest that placing a filter over the lens of the camera cannot
lower the noise of the blue channel of the CCD or CMOS sensor.
3. A blue filter will reduce the amount of light reaching the Red and
Green sensors.
4. This same blue filter will not increase or decrease the noise in
the Red and Green sensor.
If these facts are true, I suggest that the signal to noise ratio will
not be improved by placing a Blue filter over the camera lens.
Are you sure that the experiment you tried was well controlled?
Are you sure there was not some other factors that influenced your
results?
Can someone explain either the flaw in my logic or give other evidence
that would support how adding a blue filter will help the signal to
noise ratio.
Thank you,
Ray
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