Represents the "PtData" entry of the image dictionary object.

It is an optional entry defined as part of the PDF 1.7 Extension Level 3 specification.

It contains a PointDataElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 89, page 206.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 4.39, page 27.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 87, page 258.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 146, page 349.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 144, page 418.

The PtData entry holds point data associated with the image in geospatial workflows. It provides coordinate transformation data that maps specific points in the image to geographic or projected coordinate reference system positions.