Represents the "O" entry of the media screen parameters mh/be dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a double representing a PDF numeric object.

It should have a minimum value of 0 and a maximum of 1.

The PDF specification states that this item assumes a value of 1 if no value has been provided.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 283, page 499.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 294, page 625.