Represents the "Dm" entry of the transition dictionary object.

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

It contains a string representing a PDF name object.

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

This item may take one of the following valid values:.

• H
• V

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 162, page 378.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 164, page 459.

The dimension entry applies to Split and Blinds styles and selects whether the split or blind lines are horizontal (H) or vertical (V). It has no effect on other transition styles.