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: Robin Myers <email@hidden>
- Date: Wed, 21 Dec 2005 13:23:30 -0800
On Dec 20, 2005, at 18:14, Nathan Duran 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?
Remember TANSTAAFL (There Ain't No Such Thing As A Free Lunch). Any
filter you put into the optical path will decrease the total amount of
light to the sensor, thus making it necessary for the exposure and/or
the channel gains to be increased to compensate. Depending on the
camera and the camera's operating mode (e.g. shutter priority, aperture
priority, programmed exposure), the camera may make ISO adjustments
instead of exposure time or aperture adjustments for the compensation.
The ISO changes are usually gain increases, which also increases the
shot noise (digital version of film grain). If this happens, all the
image channels will show increased noise, not just the blue channel.
Robin Myers
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