Re: densitometers, what are they measuring for Alt processes

FotoDave@aol.com
Date: 03/08/01-01:38:43 PM Z

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In a message dated 3/8/01 8:56:12 AM Pacific Standard Time, watsok@frii.com
writes:

<< What you need is a "high pass" filter or one that cuts all the light form a
 certain frequency down ( towards IR ) and passes all the light from a
 certain ( blue) frequency up. >>

Yes, but one needs to make sure that the sensor is also sensitive in that
region though.

I use the Blue channel of my densitometer. It is not 100% accurate for alt.
processese, but it is good enough as an estimate.

Dave S

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