Which innovative book cover design technique, first widely adopted in the 1930s, revolutionized publishing by allowing artistic imagery to be more affordable and vibrant?

Book cover design has evolved dramatically over the centuries, from simple protective bindings to sophisticated marketing tools. Throughout publishing history, certain innovations in cover design have revolutionized how readers interact with books as physical objects and influenced the book industry's marketing strategies. This trivia question explores a pivotal moment in book cover design history that changed the publishing landscape forever.

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Dust jacket wraps
Lithographic printing
Paperback covers with offset printing
Embossed leather binding