@gfc - the next major version of Color.io includes a new Analog Diffusion and Fringe Effect. Analog Diffusion works best in combination with the updated Acutance. By combining both processes, you have the ability to diffuse and soften the image while retaining local contrast and natural clarity.

Fringe is a new creative extension of the Vignette process and allows you to diffuse the outer edges of the frame while simultaneously introducing subtle chromatic aberration.

As for the Fog & Smoke functionalities, I believe those are more aptly managed in specialized compositing applications. By concentrating solely on emulating film color and texture, Color.io can truly excel in this niche.

You can try out the beta for the next version at https://beta.color.io