The first time I shot images for this exercise, I was able to use the Tiffen filters provided, but I didn’t shoot in monochrome.

A week later I reshot the exercise using colored gels.

The results were similar to Microsoft’s legendary “undocumented features” (i.e. your computer automatically restarting): a learning experience provided by an unwanted event.

I couldn’t figure out how to merge the separate layers into one channel even using Adobe’s guide.

Image J made the process much easier , though the results were not what I was expecting to see; at least not without further experimentation, observation, and additional thought.