1. A photomechanical printing process in which an image is transferred to a metal plate using light and chemical treatment, then used for printing.
Usage: technical; printing and photography; largely historical; superseded by modern digital printing methods

Examples

• Heliotyping was a significant advancement in the 19th century for reproducing photographs in print.
• The museum's collection includes rare books produced using heliotyping techniques.
• Before digital printing, heliotyping allowed publishers to include photographic images in their publications.
• The process of heliotyping required careful control of light exposure and chemical baths.
• Early scientific journals relied on heliotyping to reproduce detailed botanical illustrations.