You can use Photoshop to turn your photos into ancient looking black and white posters. Thanks to Melissa Clifton who is offering Photoshop tutorial on how to create the black and white retro posters using Photoshop’s Halftone filter. This technique is similar to the Benday dots style which pop artist Lichtenstein used in the sixties on his comic strip paintings. It involves combining two or more colored dots to create a third color. Check out the tutorial.