Represents the "Resolution" entry of the version 1.3 opi dictionary object.

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

It contains an array which contains doubles, representing PDF numeric objects.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 369, page 640.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 406, page 824.

The Resolution entry holds a two-element array giving the horizontal and vertical resolution of the high-resolution image in pixels per unit.