The ColorResolution property specifies the resolution for downsampled color bitmaps when publishing to PDF. In order to apply the resolution, the PDFVBASettings.DownsampleColor option must be specified as True.
Examples:
The following VBA example publishes the active document to PDF. Color and grayscale bitmaps are downsampled to 72 dpi, and monochrome bitmaps are downsampled to 150 dpi.
Sub Test()
With ActiveDocument.PDFSettings
DownsampleColor = True
DownsampleGray = True
DownsampleMono = True
ColorResolution = 72
GrayResolution = 72
MonoResolution = 150
End With
ActiveDocument.PublishToPDF "C:\MyDocument.pdf"
End Sub