Reply To: Pixel Value and Exposure

[Mr Giovanni Di Giovanni]

Robin, today I promptly took RAW images (NEF nikon) of a uniformly lit white wall. As usual just varying the exposure time (from 1/50 to 1/3200); measured the Pixel Value on each RG&B channel with the soft AIP4Win. Unfortunately, the result is identical to the jpg: graph similar to the charge curve of a capacitor in RC; asymptote (maximum value) always 255. Probably my computer inexperience is deceiving me. You present a graph that is not only linear, but with values on the ordinates also much higher than my 255. I would ask you for as explicit an explanation as possible. Thank you