Digital BW, The Print

Black and white photography is about intensity - it throws away 
frequency on purpose.  That's why we do it, if I cared about frequency, 
I do color. However, a red filter (or green filter) change the gray 
scale by changing the power to the sensor.

Truman

Clive Moss wrote:

>
> ...
> Consider another experiment. The image being recorded consists of two
> halves -- one red, one green. The intensity of each half just happens to
> be such the the power sensed by the B&W CCD or film being tested is the
> same for each half. The resulting image will be an even shade of grey.
> Information has been lost, because the sensor throws away all
> information regarding the frequency of the photons. The RGB filter also
> loses some of the frequency related information -- but not all of it.
>
> The information that the eye/brain needs to process an image includes
> both power and frequency. The RGB filter loses some information related
> to the total power over a given area -- but in return it gains some
> information related to the frequency (color). A pure B&W capture loses
> almost all information related to frequency -- the more so if the sensor
> has flat response across the spectrum.
> -- 
> Clive
> http://clive.moss.net
>

-- 

We imitate our masters only because we are not yet masters ourselves, 
and only

because in doing so we learn the truth about what cannot be imitated.

 



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