It does this by trying to linearize the colors that are close to neutral (gray). Instead, we’ve developed the ‘Filter | Restore fading’ option, which compensates for different rates of fading of different dye colors.
This means it’s not practical to use film profiles to get accurate color. This makes scans of older color negative films have a color tint that doesn’t reflect the original. More significantly, most color negative films have dyes that fade differently over time for each of the three color layers. These film profiles contain ‘sensitometric curves’ for different film types, and they don’t vary much in film types in use in the past 15 years or so. We originally got film profiles from the PhotoCD database.
VueScan first started supporting different film types about 20 years.
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