Posterino

Posterino is a photo editing and image posterization tool for macOS that lets users convert colour photographs into high-contrast black and white or colour poster images with reduced colour palettes. It is designed for photographers, artists and designers who want to create stylised poster-like versions of photographs for prints, social media or artistic projects. The app offers adjustable threshold controls, colour mapping options and batch processing capabilities. Posterino has been maintained by Zykloid as a small-scale Mac app for over a decade.