albertype book printing chromotypography chromotypy chromoxylography collotype color printing electronography electrostatic printing graphic arts halftone engraving history of printing job printing letterpress letterpress photoengraving line engraving lithography lithogravure lithophotogravure mimeograph offset offset lithography onset palaeotypography photo-offset photochemical process photoengraving photogelatin process photographic reproduction photography photolithography phototypography phototypy photozincography planographic printing planography printing printmaking publication publishing relief printing rotary photogravure rotogravure sheetwork stencil three-color printing two-color printing typography typolithography wood-block printing xerography xeroprinting xylotypography zincography