>Another difference I believe is that film is logarithmic in response,
>that is to say that doubling the exposure will increase the density
>(blackness) by something like 0.3, whereas digital sensors are linear.
>Since exposure is measured logarithmically in stops, this means that a
>digital camera will have half of its brightness steps distributed within
>the brightest stop of exposure, 1/4 of them within the next brightest
>stop etc. Also the colour channels do not have the same sensitivity, and
>the in-camera processing will copy brightness values between colours for
>each pixel to maximise the exposure latitude.
>
>Jonas
Look up:
http://www.luminous-landscape.com/tutorials/expose-right.shtml
http://www.visual-vacations.com/Photography/exposure_metering_strategies.htm
Bernard
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