>I've became aware of this when I was doing similar analysis recently; >that much of the apparent "scanner noise" was in fact film grain. So >now that I'm aware of this I factor it into my testing. > >--Bill
Suggestion: Using multiscan (16 average) to eliminate scanner noise. The standard deviation will be grain. Assuming noise and grain are not correlated, noise=sqrt((single scan standard deviation)^2 -(multiscan standard deviation)^2) > >At 6:55 PM -0400 22-10-01, Mike Duncan wrote: >> >>I have standard deviation data. The problem is it's hard to tell how much >>of the standard deviation is film grain and how much is scanner noise. >>Most of the IV ED deviation is film grain. The Stouffer target has large >>grain. Mike Duncan
