Digital BW, The Print

Roy Harrington wrote:


> Seems to me this would imply an exponential relationship between the
> light energy input and the digital values from the A/D.   But I thought there
> was a linear relationship from the photon energy to the voltage out to the
> raw A/D values.

It depends on how you define "brightness." But you are correct, these 
sensors are (nearly) linear. My account is an oversimplification meant 
to introduce the concept of dynamic range in a scene being defined 
according to incidence.

--
Jeff Medkeff
Eagle River, Alaska