The basic process is simple:
1. Import digital image into Photoshop.
2. "Desaturate"
3. Adjust using "exposure" or "levels."
4. "Invert"
5. Print onto transparency--I have used Inkpress and Pictorico with good results. Use an inkjet printer.
Of course nothing about this process is simple. Different levels of contrast will give different results. I spent quite a bit of time researching "the perfect negative," but then decided to just play around in Photoshop. After all, I am not trying to make the perfect photo... Below are the Photoshop results; tomorrow the magic happens with the actual cyanotype printing.
Experimenting with contrast:
Layering, inversions:
Filters:
Making negatives out of old cyanotypes:
Playing with previous compositions:
Converting Drawings:
I also played with distortions, but don't want to post without permission from the distorted people (or their parents)...