Color Perfect approaches this differently. It operates on the principles of and Hue Shifts that mimic how film emulsion layers interact with light.
Use your scanner software (like SilverFast or VueScan) to output a "linear" or "raw" TIFF. This should look dark and flat—that’s exactly what you want. color perfect plugin
Color Perfect Plugin: How to (and how not to) Invert Negatives Color Perfect approaches this differently
Before running the plugin, ensure your image has a proper exposure and a neutral white balance. Do not apply contrast or saturation yet. color perfect plugin