Re: To David Soderman: A Little Test

[Arthur Entlich <artistic-1@xxxxxxx>]

Kennedy McEwen wrote:

>> [Kennedy McEwen:]

> 
> In a three channel CCD and it possible that each channel is calibrated 
> to a different reference level - resulting in different brightness or 
> response for each channel.  This would give very noticeable bands 
> running along the direction of the sensor.
> 

My time is a bit tight right now, so I haven't tried to digest this 
posting fully, but I am wondering, is it possible that Nikon sourced a 
triline CCD that is normally used with color separating filters on it, 
but had it made without them, and that such a CCD chip might be 
manufactured or adjusted electronically to have different overall 
amplitude characteristics per line based upon the manufacturer knowing 
that normally it has different density and responding filters on it? 
For instance, we know that the blue channel is often the most 
problematic for noise, perhaps because either the filter is more dense, 
or the CCD is less sensitive to this color range.  Might the line that 
typically is covered with the blue filter be "juiced" during some aspect 
of the design of the chip, to read higher, or whatever?

Total conjecture...

Art


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