This property determines the preferred compression method.

Not all file formats support all compression methods. Not all compression methods support all color spaces. This is why this property indicates a preferred method.

This property accepts the following values:

• 0 [Uncompressed]
• 3 [G3 Black and White Fax Compression]
• 4 [G4 Black and White Fax Compression]
• 5 [LZW Compression]
• 7 [Tiff Jpeg Compression]
• 8 [Adobe Flate Compression]
• 32946 [Flate Compression]
• 32773 [Macintosh PackBits]

In general, this property is most useful when producing output in formats like TIFF which support a range of color spaces and compression methods.

The following example shows how to render a PDF into a multipage G4 compressed Fax TIFF using different vertical and horizontal resolutions.

Set theDoc = Server.CreateObject("ABCpdf11.Doc")
theDoc.Read "c:\mypdfs\spaceshuttle.pdf"
' set up the rendering parameters
theDoc.Rendering.ColorSpace = "Gray"
theDoc.Rendering.BitsPerChannel = 1
theDoc.Rendering.DotsPerInchX = 200
theDoc.Rendering.DotsPerInchY = 400
' loop through the pages
n = theDoc.PageCount
For i = 1 To n
  theDoc.PageNumber = i
  theDoc.Rect = theDoc.CropBox
  theDoc.Rendering.SaveAppend = (i <> 1)
  theDoc.Rendering.SaveCompression = 4 ' G4 Fax
  theDoc.Rendering.Save "c:\mypdfs\fax.tif"
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