Posterizing Colors Nondestructively in Photoshop

Deke recolors his Hair-inspired poster art using a nondestructive Gradient Map adjustment with custom gradient

Contour Mapping for Cash in Photoshop

Deke uses his contour map skills to make a portrait effect suitable for use on American currency

Contour Mapping with Distort > Displace

Deke uses a displacement map to contour a stripe pattern to his model's face.

Tripping on Arbitrary Maps