Re: Colorsync-users Digest, Vol 2, Issue 504 -capture and printing noise
Re: Colorsync-users Digest, Vol 2, Issue 504 -capture and printing noise
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 504 -capture and printing noise
- From: Karsten Krüger <email@hidden>
- Date: Tue, 20 Dec 2005 11:36:46 +0100
Thanks for your comments, Stefan.
This makes perfect sense. Now I understand what is going on.
When I put a filter on my camera, this will make all chanels get the
same light intensity again - but at 1600 ASA ? More noise, less
detail. Why not de-noise after shooting by software ?
Thanks,
Karsten
Am 20.12.2005 um 10:54 schrieb Stefan Steib:
Now- if you use Tungsten Lighting, no matter how bright it is (and
thats something that looks completely different for your eyes
because our brain
compensates the difference) the spectrum of the used light is
completely shifted into the red, lacking most of the emission in
the blue,
nearly the same applies to the green channel. After a whitebalance
the cameraback now acts as a channel amplifier and has to increase
x-times of signal to noise ratio of the blue channel so that it
reaches equal dense channel information as with a daylight spectrum.
while this may not be as much apparent while shooting with 100 ASA
(though its exactly the same effect), at 400 ASA this is
intensified by a factor of 16 !
Means when your red channel has a signal to noise factor of lets
say 1:100, the green already goes down to 1:12 ,the blue is down to
1:6.
Now you can imagine that actually you shoot your cameraback at 1600
ASA in the Blue channel......................no wonder there is noise!
The only way to get over this is to use a blue compensation filter
for tungsten.............well nothing new, as with film this was
exactly the same.
Anybody remembers these funny pieces of rolled plastic that were
put into cameras....................<GGG> ???
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