Tricolour – Assembling an Image

This illustrates using Photoshop in assembling an image from scans of 3 separation negatives made using red, green & blue separation filters.

The picture is typical of the sort of subject that was used in the heyday of Tricolour in advertising, before the advent of good quality integral trip-pack films.
The usual separation filters were used, Wrattens 25 (Red) 47B (Blue) &