Disclaimer: this is a work-in-progress and not a definitive workflow. I’m sharing it as my reader has expressed an interest in what I’ve been doing with Trichrome post-processing. I’m currently using Photoshop 2022 but plan to explore this process in Affinity Photo too at some point. Please note I have assumed at least a basic knowledge of Photoshop in preparing these notes.
So, the first step is to scan the images and I will work on the basis that anyone considering this process already has scanning under control. These scanned triplets then need preparing and I do this in Photoshop.
We now have a file containing the three different images, each with the filter colour displayed as part of the layers name. This will be very handy in the next stage but first we need to align the images so they match up properly and, optionally, trim off any excess around the edges.
Having got the three negatives aligned and in register we come to the bit where the magic happens. Firstly though, it is wise to double check that the file is in RGB mode at this stage (Image > Mode > RGB).
If I’ve copied this down properly from my notes you should now have a basic colour image on your screen, a negative or a positive depending on whether you inverted the black and white layers earlier. From here it business as usual as you tweak the image to your taste. For me I am currently choosing to leave myself with a colour negative which I import into Lightroom in order to convert it with Negative Lab Pro (NLP). In the example below, the left hand image was a colour negative that I inverted in Photoshop and tweaked using colour balance etcetera. The right hand image was imported as a colour negative into Lightroom and put through NLP without any further adjustments. Both versions have their merits of course.
Whether you prefer one version or another is of course purely a personal choice and partly dependent on your aims. If your aim is to get as close to a natural colour image as possible then you will post-process appropriately and likewise if the lysergic aesthetic appeals you will post-process accordingly. It’s good to know there are choices.
So, there you have it. An approach to creating Trichrome images from three black and white negatives. Note my previous disclaimer though; this is a work in progress and not a definitive workflow. As and when I make further progress or add refinements I will share them on the blog.