Self-portrait of Antonie van Dyck

Jacob Christoph Le Blon, or Jakob Christoffel Le Blon, was a painter and engraver from Frankfurt who invented a halftone color printing system with three and four copper dyes using an RYB color model, which served as the foundation for the modern CMYK system. He used the mezzotint method to engrave three or four copper plates to make prints of paintings and portraits with a wide range of colors.

Zurich