Specifies control parameters for PDF image saving.

Values:

IG_PDF_DONT_SAVE_FILE_ATTRIBUTES	Prevents the file attributes and security settings of a PDF document opened from an existing PDF file from being copied over when saved to a new PDF file.
IG_PDF_LINEARIZED	Writes the file linearized for page serving over the remote connections.
IG_PDF_OPTIMIZE_XOBJECTS	Merges identical forms and images, as determined by an MD5 hash of their contents.
IG_PDF_OPTIMIZED	Performs garbage collection on unreferenced objects.