Autochrome is Additive, and chromogenic systems are Subtractive. Thus, one uses R/G/B and the other uses C/M/Y.

Unfortunately, if you use Additive systems on reflective support you get mainly black and white images, and this is why inkjet printers use a combination of Additive and Subtractive images to attain a full colored image. To gain saturation via these methods, inkjet printers also must use a "K" channel with Black ink. This is similar to that used in the printing industry.

This relates to Autochrome and Dufay color only in that both of these used Additive systems which can only be successfully used with transmission materials unless modified as noted above in this post.

PE