Converting conventional exposure values to Log E

I think the tie-in that you are looking for is to plot the densities against the Exposure Index values which were used in making the exposures for which you are measuring the density. The EI is a direct measure of how much light is reaching the film. It should be in logarithmic units, like the old DIN film speed ratings. This is explained in more detail in my website www.vsta.com/~alrob

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