I think of all the print process workshops I have had as part of this module, the session on duotone was my favorite. I think this was because it is partly a creative process in image manipulation as well as a way to print images using just two inks. We were shown how to create a true duotone image in photoshop out of a full colour picture. First it has to be converted into grayscale, then you can switch the mode to duotone (or tritone) and select colours and adjust how these colours interact using the duotone curves, all fun stuff.
This is the full colour image I started with, a rather lovely Ferrari 250 GT california spider (aka the ferris bueller model)
Duo tone using blue and green.
Blue and Red duotone, lots of curves adjustments in this one to keep the hightlighs white.
TriTone, yellow red and blue to give retro feel.
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