Message text written by INTERNET:[EMAIL PROTECTED] >This is interesting! Since the silver halides respond to the cumulative effect of light, it is unlikely that the digital sensor would behave in a similar manner. I could be wrong, (and I have been before) but I believe that the different ISO speeds are achieved by processing the received signal/light. This result in ordinary images at higher ISO settings.
Bob< higher ISOs are achieved mostly by increasing the analog gain of the amplifiers. this leads to a lot of thermal noise. at least for consumer cameras, that also means hot spots as individual pixels may go very nonlinear. i have been thinking about writing a Photoshop filter to handle this type of noise where you get pure R, G, or B hot spots. they can be found because there is near no response in the other two channels at that position. Herb....
