Sets the measurement resolutions, which affects the measurements
for certain output formats that does not support physical sizes.
For example, SWF measurements are pixel-based while PDF
measurements are in points (1/72 of an inch). This specifies how
many pixels in SWF an inch in PDF represents.
The values do not affect the pixel sizes of raster-image
contents. If one of the values (dpiX or dpiY) is invalid, the other
value may be used for both values.
For SWF, these values are used only if XSaveOptions.Template