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Glossary Of Printing Terms [4]

O Offset Printing Offset printing, also known as offset lithography, is a widely used printing technique in which ink is transferred from a printing plate to a rubber blanket cylinder and then onto the printing substrate, typically paper. Offset printing is based on the principle of oil and water repulsion, where the image areas on the printing plate attract ink, while the non-image areas repel ink. Offset printing is capable of producing high-quality prints with sharp detail, vibrant colors, and consistent results, making it suitable for a wide range of applications, including newspapers, magazines, books, packaging, and marketing materials. Offset printing offers advantages such as fast printing speeds, cost-effectiveness for large print runs, and compatibility with a variety of paper stocks and finishes.
Outer form the printing surface containing the pages from which the outer side of a sheet is printed and including matter for the first page of the printed sheet.
Overlay In printing, it can mean three different things. 1. A shaped piece of paper, or a sheet of paper reinforced at the proper places by shaped pieces, put on the tympan of a press to increase or equalize the impression. 2. A method of preparing copy for multicolor printing, in which matter for each color is prepared on a transparent sheet that is placed over a key plate, usually the one to be printed in black. 3. The sheet or sheets so prepared.
Overprint An additional layer of text or graphics added to the face of a postage stamp, banknote or postal stationery after it has been printed. Post offices most often use overprints for internal administrative purposes such as accounting but they are also employed in public mail. The most well-recognized varieties are commemorative overprints which are produced for their public appeal and command significant interest in the field of philately.