Ink simulation in Photoshop
This is a screenshot from Illustrator. These are MDF plates. From left to right, black, red, and yellow. Solid black regions inside the image frame are un-lased areas to be hand carved later to save on the fume extraction consumables (to lessen the smoke generation). You can see some areas were cut off to make holes instead of having to carve them out by hand later (You can see that around 1:40 into the YouTube linked above).
Tri-Tone letterpress portrait pressed using our Vandercook 232P proof-Tess.