I think every digital camera, scanner and even the hdr cameras works in the same way.
An untouched raw file from camera or scanner is in linear light…
I will try setting the gamma gradation to 2.2, and 2.4 in Silverfast (the default value is 2.0, which is probably what I’ve used, apparently the appropriate value for HD is 2.4, and 2.6 for digital cinema), but having examined the frames themselves, I think your correction is a little strong on contrast and saturation. The contrast and saturation closely match the Senator photos, but photographs of a projection enhance contrast, so I’m pretty confident contrast and saturation should be reduced. To be continued…