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Glossary

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Object-Oriented
An approach in drawing and layout programs that treat graphics as line and arc segments rather than individual dots. Also called vector oriented.

Oblong
A booklet or catalog bound on the shorter dimension.

OCR
Optical character recognition; technology enabling printed text to be scanned and interpreted yielding a text file.

Off Loading
Relieving the intensive amount of data proccessing associated with a specific application from the CPU, by performing those calculations in a dedicated or specialized processor.

Off-Press Proofs
Proofs made by photomechanical or digital means in less time and at lower cost than press proofs.

Offset
The process of using an intermediate blanket cylinder to transfer an image from the image carrier to the substrate.

Offset Gravure
Printing Gravure by the offset principle. Generally done on a flexographic press by converting the anilox roller to a gravure image cylinder and converting the plate cylinder with a solid rubber plate.

Offset Press
Press design in which an image is transferred from a plate to a rubber blanket that transfers the image to the press sheet; offset technology allows plates to be right reading and gives higher-quality images that direct transfers.

Oleophobic
Oil repellent

Olephillic
Oil Receptive

Opacity
Obstruction of the passage of light through a sheet of paper.

Opaque
To paint out areas on a negative not wanted on the plate . The property which makes it less transparent.

Opaque Ink
An ink that conceals all color beanth it.

OPI (Open Press Interface)
An extension to Postscript tat automatically replaces low-res placeholder images with high-resolution images.

Orthochromatic
Photographics surfaces insensitive to red but sensitive to ultraviolet, blue, gree and yellow rays.

Outline Font
Font composed of characters represented by mathematical curves describing their outlines. PostScript and TrueType fonts are both outline font formats.

Overhang Corner
A cover larger that the pages it encloses.

Overlay
A transparent covering over the copy where color break, instructions or corrections are marked. Also, transparent or translucent prints which when placed one on the other form a composite picture.

Overlay Proof
A color proof produced with four dyed or pigmented overlay films.

Overprinting
Double printing; printing over an area that already has been printed.

Overrun
Copies printe in excess of the specified quantity.